[llvm] [LoopVectorize] Peek through bitcasts when performing CSE (PR #146856)

[Ramkumar Ramachandra via llvm-commits]

================
@@ -2643,7 +2643,8 @@ namespace {
 struct CSEDenseMapInfo {
   static bool canHandle(const Instruction *I) {
     return isa<InsertElementInst>(I) || isa<ExtractElementInst>(I) ||
-           isa<ShuffleVectorInst>(I) || isa<GetElementPtrInst>(I);
+           isa<ShuffleVectorInst>(I) || isa<GetElementPtrInst>(I) ||
+           isa<BitCastInst>(I);
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artagnon wrote:

```suggestion
           isa<ShuffleVectorInst, GetElementPtrInst, BitCastInst>(I);
```

https://github.com/llvm/llvm-project/pull/146856