[llvm] [LV][VPlan] set FastMathFlags on EVLRecipe (PR #119847)

[Mel Chen via llvm-commits]

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@@ -976,8 +976,11 @@ void VPWidenIntrinsicRecipe::execute(VPTransformState &State) {
     CI->getOperandBundlesAsDefs(OpBundles);
 
   CallInst *V = State.Builder.CreateCall(VectorF, Args, OpBundles);
-
-  setFlags(V);
+  // vector-predication intrinsics only accept FMF flags, while vector intrinsic
+  // can support all flags.
+  bool VPIntrinsic = VPIntrinsic::isVPIntrinsic(VectorIntrinsicID);
+  if ((VPIntrinsic && isa<FPMathOperator>(V)) || !VPIntrinsic)
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Mel-Chen wrote:

I'm thinking whether we need this check. 
Is it possible to use the existing constructor to pass in an `OpType` other than `FPMathOp` when constructing vp intrinsic?

https://github.com/llvm/llvm-project/pull/119847