[llvm] [LoadStoreVectorizer] Propagate alignment through contiguous chain (PR #145733)

[Drew Kersnar via llvm-commits]

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@@ -1634,3 +1638,32 @@ std::optional<APInt> Vectorizer::getConstantOffset(Value *PtrA, Value *PtrB,
         .sextOrTrunc(OrigBitWidth);
   return std::nullopt;
 }
+
+void Vectorizer::propagateBestAlignmentsInChain(ArrayRef<ChainElem> C) const {
+  auto PropagateAlignments = [](auto ChainIt) {
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dakersnar wrote:

Hmm, I can't figure out a way to have this take in both the iterator and the reverse iterator without it being a templated helper function. I was leaning towards this lambda approach because it is only used in this one function, do you think a separate helper would still be preferred even if we need to use a template? Open to ideas.

https://github.com/llvm/llvm-project/pull/145733