[llvm] [DSE] Simpily if condition (NFC) (PR #137777)

[via llvm-commits]

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@@ -1210,13 +1210,11 @@ struct DSEState {
   bool isInvisibleToCallerAfterRet(const Value *V) {
     if (isa<AllocaInst>(V))
       return true;
+
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NewSigma wrote:

Break a line for better readability. Feel free to tell me if it should not appear in this patch.

https://github.com/llvm/llvm-project/pull/137777