[clang] [llvm] [SROA] Vector promote some memsets (PR #133301)

[via llvm-commits]

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@@ -1170,10 +1191,23 @@ class AllocaSlices::SliceBuilder : public PtrUseVisitor<SliceBuilder> {
     if (!IsOffsetKnown)
       return PI.setAborted(&II);
 
+    auto IsSplittable = [&]() {
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macurtis-amd wrote:

Cleaned up code removes the helper altogether. Hopefully better now.

https://github.com/llvm/llvm-project/pull/133301