[llvm-branch-commits] [Clang][MemProf] Add end-to-end test for PGHO rewriting (PR #169243)

[Marco Elver via llvm-branch-commits]

https://github.com/melver created https://github.com/llvm/llvm-project/pull/169243

Adds an end-to-end (non-LTO) test verifying that the optimization
pipeline is set up correctly for Profile Guided Heap Optimization (PGHO)
transforms. Ensure that both PGHO and AllocToken can stack, and the
AllocToken pass does not interfere with PGHO and vice versa.