Export of internal Abseil changes

--
84bcdcd9497d1ec989f50c8dee93f656507c7bd6 by Abseil Team <absl-team@google.com>:

Reduce length of the `flat_hash_map<std::string, V>` type name in order to reduce binary bloat.

PiperOrigin-RevId: 391560997

--
5f49bd435e066989851dc045c7786ef400413f66 by Greg Falcon <gfalcon@google.com>:

Claim a bit from the Cord refcount for future use.

Also rename the increasingly-inaccurately named "Refcount" class to "RefcountAndFlags".

In optimized builds, this adds an extra mask instruction to decrement and test operations, but no new branches.  Future flags can be added at no extra cost.  Each additional flag will of course reduce the range of our refcount, but even with the bit added, we still support refcounts of 500 million.

PiperOrigin-RevId: 391557567
GitOrigin-RevId: 84bcdcd9497d1ec989f50c8dee93f656507c7bd6
Change-Id: I051823bf5a9a42d4fa9200e39563ab585ecab331

1 files changed, 17 insertions, 15 deletions

diff --git a/absl/container/internal/hash_function_defaults.h b/absl/container/internal/hash_function_defaults.h
index 0683422a..250e662c 100644
--- a/absl/container/internal/hash_function_defaults.h
+++ b/absl/container/internal/hash_function_defaults.h
@@ -78,24 +78,26 @@ struct StringHash {
   }
 };
 
+struct StringEq {
+  using is_transparent = void;
+  bool operator()(absl::string_view lhs, absl::string_view rhs) const {
+    return lhs == rhs;
+  }
+  bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const {
+    return lhs == rhs;
+  }
+  bool operator()(const absl::Cord& lhs, absl::string_view rhs) const {
+    return lhs == rhs;
+  }
+  bool operator()(absl::string_view lhs, const absl::Cord& rhs) const {
+    return lhs == rhs;
+  }
+};
+
 // Supports heterogeneous lookup for string-like elements.
 struct StringHashEq {
   using Hash = StringHash;
-  struct Eq {
-    using is_transparent = void;
-    bool operator()(absl::string_view lhs, absl::string_view rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(const absl::Cord& lhs, absl::string_view rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(absl::string_view lhs, const absl::Cord& rhs) const {
-      return lhs == rhs;
-    }
-  };
+  using Eq = StringEq;
 };
 
 template <>