[llvm] [LSV] Insert casts to vectorize mismatched types (PR #134436)

[Matt Arsenault via llvm-commits]

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@@ -1495,7 +1629,7 @@ Vectorizer::collectEquivalenceClasses(BasicBlock::iterator Begin,
          /*IsLoad=*/LI != nullptr}]
         .emplace_back(&I);
   }
-
+  insertCastsToMergeClasses(Ret);
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arsenm wrote:

This is eagerly mutating the IR before vectorization is performed? Should try to only select a type, and coerce as part of the final vectorization 

https://github.com/llvm/llvm-project/pull/134436