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

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xiangzh1 wrote:

> LoopUnroll supports upper bound unrolling. Why is it not working in this case?
for example:
#program unroll
for (int I = 0; I < LoopCount; ++I) { // ConstNum > 1
if (Cond2) {
break;
}
xxx loop body;
}

After the branches fodling, the old loop condition  "I < LoopCount" 
changed/disapeared, I think unroll can not make sure the "upper bound"

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