[llvm] [MemCpyOpt] Merge memset and skip unrelated clobber in one scan (PR #90350)

[Nikita Popov via llvm-commits]

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@@ -350,157 +434,157 @@ static void combineAAMetadata(Instruction *ReplInst, Instruction *I) {
   combineMetadata(ReplInst, I, KnownIDs, true);
 }
 
+static bool isCandidateToMergeIntoMemset(Instruction *I, const DataLayout &DL,
+                                         Value *&ByteVal) {
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nikic wrote:

Can we return ByteVal instead (or nullptr)?

https://github.com/llvm/llvm-project/pull/90350