Fix the implementation of OnlyLiteralZero (abseil#1420)

This patch changes the implementation of OnlyLiteralZero to only fail if the second overload is chosen, instead of failing during overload resolution.

This patch cherry-picks 2de126c.

Fixes abseil#1419

Make `SanitizerSafeCopy()` constexpr, and check for constant evaluati…

…on (abseil#1399)

Also update test Docker container so that LTS patches can be tested

This patch cherry-picks 2 commits:
a0f9b46
35e8e3f

Apply LTS transformations for 20230125 LTS branch (abseil#1370)

Apply LTS transformations for 20230125 LTS branch (abseil#1370)

Switch time_state to explicit default initialization instead of value…

… initialization. (abseil#1261)

It looks to me like the language rules treat these the same for this type, but evidently GCC feels differently.

This only matters under TSAN where SpinLock has a non-trivial destructor, and under C++20 where ABSL_CONST_INIT is implemented (as constinit) by gcc.

Fixes abseil#1253

PiperOrigin-RevId: 469806751
Change-Id: Ic01b0142101f361bc19c95f9f9474e635669c58d

Apply LTS transformations for 20220623 LTS branch (abseil#1202)

Apply LTS transformations for 20220623 LTS branch (abseil#1202)

Fix Android build of elf_mem_image.cc (abseil#1052)

Fix Android build of elf_mem_image.cc (abseil#1052)

Abseil LTS 20210324, Patch 2

* Fixes build with glibc 2.34 (abseil#952)
* Fixes "illegal thread local variable" on some Apple platforms (abseil#954, abseil#965)