Export of internal Abseil changes

--
642ab296a2c9629c44f3f2ce6911cd2488bcf416 by Derek Mauro <dmauro@google.com>:

Remove an obsolete check in CMakeLists.txt

PiperOrigin-RevId: 352852564

--
ce78cb96bcfd162737dbcf35005da3d1d6a3486b by Abseil Team <absl-team@google.com>:

Clarify that the calling *thread* must have locked the mutex in order to unlock
it.

PiperOrigin-RevId: 352801804

--
24e1f5f72756046f5265abf618e951c341f09b8d by Derek Mauro <dmauro@google.com>:

Fixes failing CMake string comparisons
https://cmake.org/cmake/help/latest/policy/CMP0054.html

Fixes #791

PiperOrigin-RevId: 352791054

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0ac10bc3f4dca2c4c4b51d7b8196a2eaee9537a1 by Abseil Team <absl-team@google.com>:

Introduce CordRepRing class

This change introduces the CordRepRing class that implements all the lower level / internal implementation for upcoming CordRepRing ring buffer support in cord.

PiperOrigin-RevId: 352771994

--
4bd36dda61760785844f0f29f26d90cc18046f75 by Abseil Team <absl-team@google.com>:

Optimize InlineData representation for cord sampling (cordz)

This CL changes InlineData to allow us to store a (future) Cordz Info pointer directly into the inline representation:

- make InlineData a class that provides a public API to set the active union members (tree or chars) and safely access that data.
- change 'tree' and 'profiled' bits to be the 2 least significant bits, allowing us 62 continquous bits for storing a Cordz Info pointer.

PiperOrigin-RevId: 352642411

--
dc55ba71bbce0e6a83e05a453990c51ac3d68426 by Mark Barolak <mbar@google.com>:

Add unit test coverage for the mutating overload of absl::AsciiStrToLower.

PiperOrigin-RevId: 352626006
GitOrigin-RevId: 642ab296a2c9629c44f3f2ce6911cd2488bcf416
Change-Id: I6c5929dd830d3c630e14e7fd5387fc3e25a69100

1 files changed, 8 insertions, 8 deletions

diff --git a/absl/copts/AbseilConfigureCopts.cmake b/absl/copts/AbseilConfigureCopts.cmake
index acd46d04..90a1449d 100644
--- a/absl/copts/AbseilConfigureCopts.cmake
+++ b/absl/copts/AbseilConfigureCopts.cmake
@@ -12,16 +12,16 @@ else()
   set(ABSL_BUILD_DLL FALSE)
 endif()
 
-if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64|amd64|AMD64")
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64|AMD64")
   if (MSVC)
     set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")
   else()
     set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_X64_FLAGS}")
   endif()
-elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm.*|aarch64")
-  if ("${CMAKE_SIZEOF_VOID_P}" STREQUAL "8")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm.*|aarch64")
+  if (CMAKE_SIZEOF_VOID_P STREQUAL "8")
     set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM64_FLAGS}")
-  elseif("${CMAKE_SIZEOF_VOID_P}" STREQUAL "4")
+  elseif(CMAKE_SIZEOF_VOID_P STREQUAL "4")
     set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM32_FLAGS}")
   else()
     message(WARNING "Value of CMAKE_SIZEOF_VOID_P (${CMAKE_SIZEOF_VOID_P}) is not supported.")
@@ -32,10 +32,10 @@ else()
 endif()
 
 
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
   set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
-elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
   # MATCHES so we get both Clang and AppleClang
   if(MSVC)
     # clang-cl is half MSVC, half LLVM
@@ -45,7 +45,7 @@ elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
   else()
     set(ABSL_DEFAULT_COPTS "${ABSL_LLVM_FLAGS}")
     set(ABSL_TEST_COPTS "${ABSL_LLVM_FLAGS};${ABSL_LLVM_TEST_FLAGS}")
-    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
       # AppleClang doesn't have lsan
       # https://developer.apple.com/documentation/code_diagnostics
       if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
@@ -54,7 +54,7 @@ elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
       endif()
     endif()
   endif()
-elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
   set(ABSL_DEFAULT_COPTS "${ABSL_MSVC_FLAGS}")
   set(ABSL_TEST_COPTS "${ABSL_MSVC_FLAGS};${ABSL_MSVC_TEST_FLAGS}")
   set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")