[clang] [flang] [llvm] [TargetVerifier][AMDGPU] Add TargetVerifier. (PR #123609)

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jofrn wrote:

> I still can't figure it out why we need TargetVerifier.h and TargetVerifier.cpp in the first place.

If we want to call TargetVerify from StandardInstrumentations.cpp, then we need it because this is a target-independent location to run TargetVerify in between each pass. Working on removing it at the moment.

https://github.com/llvm/llvm-project/pull/123609