[compiler-rt] [ctx_profile] Integration test (PR #92456)

[Michał Górny via llvm-commits]

mgorny wrote:

This is a standalone build against installed LLVM + Clang. Once you install these two, the absolute minimum is roughly:

```
$ cmake -G Ninja <path-to-source>/compiler-rt -DCOMPILER_RT_INCLUDE_TESTS=ON
$ ninja check-ctx_profile 
```

To get tests working, you'd also have to install the libraries onto the system. However, this is enough to reproduce the immediate problem.

https://github.com/llvm/llvm-project/pull/92456