[clang] Update GoogleTest to v1.14.0 (PR #65823)

[Björn Pettersson via cfe-commits]

bjope wrote:

> > Ok, seems like the only problem is the MemProf unit test compiler-rt/lib/memprof/tests/
> > So if I manually disable that I don't see any other failures with this patch.
> 
> I think any components that uses freshly built clang (stage1) could potentially run into this problem again, the correct way to solve it is to provide a compatible C++ Library to the freshly built clang when it built compiler-rt and related tests. For example, use -D with `RUNTIMES_${target}_CMAKE_CXX_FLAGS` and `RUNTIMES_${target}_CMAKE_CXX_FLAGS` to pass `--gcc-toolchain` (it might be deprecated and there is an updated flag for it) to the runtimes build. This will probably allow stage1 clang to use gcc's stdlib like your bootstrap clang.

Thanks! Yes, I think we hadn't considered that some things we set up for the regular build wasn't forwarded to the compiler-rt test.
When setting
  `-DRUNTIMES_${target}_COMPILER_RT_TEST_COMPILER_CFLAGS=--gcc-toolchain=<path-to-toolchain>`
the problem @mikaelholmen mentioned disappeared. I haven't tried adding it to CMAKE_CXX_FLAGS, but maybe that is a better option.

https://github.com/llvm/llvm-project/pull/65823