[clang] [llvm] [SimplifyCFG] Not folding branch in loop header with constant iterations (PR #74268)

[via cfe-commits]

bcl5980 wrote:

We should add TTI check for the condition. I believe don't unroll on X86 is a correct decision.
Only like AMDGPU or NVPTX these GPU target with heavy stack cost backend target need this.

https://github.com/llvm/llvm-project/pull/74268