[llvm] [AMDGPU] Added hot-block-rematerialize pass (PR #126331)

[Adam Yang via llvm-commits]

adam-yang wrote:

> Hi @adam-yang, I've done some testing with this patch and noticed that options `-amdgpu-remat-enable-hot-block-remat-aggressive` and `-amdgpu-remat-enable-sub-exp-remat` seem to cause many crashes in the compiler. Are you interested in test cases for these? Or are these options not expected to be working yet?

Yes could you send them to me please.

https://github.com/llvm/llvm-project/pull/126331