[llvm] [AArch64] Fix a minor issue with AArch64LoopIdiomTransform (PR #78136)

[David Sherwood via llvm-commits]

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@@ -370,8 +370,9 @@ bool AArch64LoopIdiomTransform::recognizeByteCompare() {
       // same as the end value (MaxLen) so we permit either. Otherwise for any
       // other value defined outside the loop we only allow values that are the
       // same as the exit value for while.body.
-      if (WhileCondVal != Index && WhileCondVal != MaxLen &&
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david-arm wrote:

Done! Whilst writing it I realised I need to also tighten up the while.body value to only permit the Index. The tests still pass!

https://github.com/llvm/llvm-project/pull/78136