Export of internal Abseil changes

--
017c3924d21132085bc20c9be0ae469bfbf2c56c by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 338723934

--
8b08c23d7b05232e283b1388cee3eb5bebc2d9c4 by Derek Mauro <dmauro@google.com>:

Add script to test GCC floor (the minimum version of GCC we support,
currently the GCC 5 series)

PiperOrigin-RevId: 338708581

--
afa440ac7c843126b4f99b89ebc071dda1d85a4d by Abseil Team <absl-team@google.com>:

Fix typo in documentation of StatusOr::value_or() ('of' -> 'if').

PiperOrigin-RevId: 338690089

--
97d5008865327fc36b942b96de0d0cacfb909df5 by Derek Mauro <dmauro@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 338568224

--
da5e09a7fedb3217329465d9206b7cbc6677176b by Abseil Team <absl-team@google.com>:

Add `absl_btree_prefer_linear_node_search`

Allow keys of `btree_set`, `btree_map`, `btree_multiset`, and `btree_multimap`
to opt-in to linear search (instead of binary search).  Linear search was
used previously for arithmetic types with `key_compare` of `std::greater`
or `std::less`.

For example, this would be useful for key types that wrap an integer
and define their own cheap `operator<()`.

```
 class K {
  public:
   using absl_btree_prefer_linear_node_search = std::true_type;
   ...
  private:
   friend bool operator<(K a, K b) { return a.k_ < b.k_; }
   int k_;
 };

 absl::btree_map<K, V> m;  // Uses linear search
 assert((absl::btree_map<K, V>::testonly_uses_linear_node_search()));
```

PiperOrigin-RevId: 338476553

--
c56ead7ce6b0a5ad32e3a42904c686448a69451e by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 338419417
GitOrigin-RevId: 017c3924d21132085bc20c9be0ae469bfbf2c56c
Change-Id: I1199f3ae917280a3ef20ccc6038abbe34d96ec0b

23 files changed, 0 insertions, 0 deletions

diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/ACT b/absl/time/internal/cctz/testdata/zoneinfo/Australia/ACT
index 7636592a..f235d0dc 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/ACT
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/ACT
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Adelaide b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Adelaide
index 0b1252ab..f397b3b9 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Adelaide
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Adelaide
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Brisbane b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Brisbane
index 3021bdb6..c7915db3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Brisbane
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Brisbane
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Broken_Hill b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Broken_Hill
index 1ac3fc8f..ed0d17a6 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Broken_Hill
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Broken_Hill
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Canberra b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Canberra
index 7636592a..f235d0dc 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Canberra
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Canberra
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Currie b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Currie
index f65a990e..55ceaefc 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Currie
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Currie
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Darwin b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Darwin
index 1cf50298..7114153b 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Darwin
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Darwin
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Eucla b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Eucla
index 98ae5570..9fbc01fe 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Eucla
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Eucla
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Hobart b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Hobart
index 02b07ca2..21ef2d39 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Hobart
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Hobart
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/LHI b/absl/time/internal/cctz/testdata/zoneinfo/Australia/LHI
index 9e04a80e..4d4ec8ce 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/LHI
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/LHI
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lindeman b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lindeman
index eab0fb99..e271d5b3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lindeman
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lindeman
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lord_Howe b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lord_Howe
index 9e04a80e..4d4ec8ce 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lord_Howe
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Lord_Howe
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Melbourne b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Melbourne
index ba457338..c7160da3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Melbourne
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Melbourne
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/NSW b/absl/time/internal/cctz/testdata/zoneinfo/Australia/NSW
index 7636592a..f235d0dc 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/NSW
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/NSW
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/North b/absl/time/internal/cctz/testdata/zoneinfo/Australia/North
index 1cf50298..7114153b 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/North
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/North
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Perth b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Perth
index a876b9e7..e449b03f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Perth
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Perth
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Queensland b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Queensland
index 3021bdb6..c7915db3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Queensland
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Queensland
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/South b/absl/time/internal/cctz/testdata/zoneinfo/Australia/South
index 0b1252ab..f397b3b9 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/South
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/South
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Sydney b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Sydney
index 7636592a..f235d0dc 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Sydney
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Sydney
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Tasmania b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Tasmania
index 02b07ca2..21ef2d39 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Tasmania
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Tasmania
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Victoria b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Victoria
index ba457338..c7160da3 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Victoria
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Victoria
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/West b/absl/time/internal/cctz/testdata/zoneinfo/Australia/West
index a876b9e7..e449b03f 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/West
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/West
diff --git a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Yancowinna b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Yancowinna
index 1ac3fc8f..ed0d17a6 100644
--- a/absl/time/internal/cctz/testdata/zoneinfo/Australia/Yancowinna
+++ b/absl/time/internal/cctz/testdata/zoneinfo/Australia/Yancowinna