[llvm] [InstCombine][VectorCombine] Move bitcast vp.load fold into VectorCombine (PR #200321)

[Luke Lau via llvm-commits]

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@@ -5823,6 +5824,67 @@ bool VectorCombine::foldDeinterleaveIntrinsics(Instruction &I) {
   return true;
 }
 
+bool VectorCombine::foldBitcastOfVPLoad(Instruction &I) {
+  const DataLayout &DL = I.getDataLayout();
+  auto *Cast = dyn_cast<CastInst>(&I);
+  if (!Cast || !Cast->isNoopCast(DL) || !isa<VectorType>(Cast->getDestTy()))
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lukel97 wrote:

There's no isNoopCast pattern matcher unfortunately, but used pattern match for the vp.load in a0599d067444

https://github.com/llvm/llvm-project/pull/200321