[compiler-rt] [rtsan] Link in proper CXX ABI library (PR #109715)

[via llvm-commits]

zeroomega wrote:

> Thanks for looking, I will continue investigating.
> 
> Is there any easy way for me to run builds against this system for me to verify any potential fixes without bugging you?

If you have a branch in your public repo, I can launch a build job for you. You can ping me on discord. I am 'zeroomega86' on discord. Please rebase your branch against upstream main branch. 

e.g. I uses https://github.com/zeroomega/llvm-project/commit/642d4c813663fce79f787e0fcb59e9b209f5464c to instrument the build file. The build task is https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci.shadow/clang-mac-x64/b8735967159680657121/overview 

You can see output:

```
in asan RTSAN_LINK_LIBS is 
in asan SANITIZER_CXX_ABI_LIBRARIES is 
in asan SANITIZER_COMMON_LINK_LIBS is c
in rtsan RTSAN_LINK_LIBS is c++;c
in rtsan SANITIZER_CXX_ABI_LIBRARIES is c++;c
in rtsan SANITIZER_COMMON_LINK_LIBS is c
```

In https://logs.chromium.org/logs/fuchsia/buildbucket/cr-buildbucket/8735967159680657121/+/u/clang/build/stdout



https://github.com/llvm/llvm-project/pull/109715