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

[via cfe-commits]

xiangzh1 wrote:

I think we should follow this principle：
if a loop required to be unroll later, we should not distroy the loop count 
info.

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