[clang] [compiler-rt] Reland [Coverage] Fix region termination for GNU statement expressions (PR #132222)

[Justin Cady via llvm-commits]

justincady wrote:

This is the buildbot failure from the initial commit: https://lab.llvm.org/buildbot/#/builders/133/builds/13131

I updated the failing test with the same restrictions as other tests using `-fuse-ld=lld` under `compiler-rt/test/profile/Linux`, specifically:

```
// REQUIRES: lld-available
// XFAIL: powerpc64-target-arch
```

https://github.com/llvm/llvm-project/pull/132222