[llvm] Add LoopVectorizer support for `llvm.vector.partial.reduce.fadd` (PR #163975)

[Benjamin Maxwell via llvm-commits]

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@@ -372,7 +372,7 @@ InstructionCost WebAssemblyTTIImpl::getPartialReductionCost(
     unsigned Opcode, Type *InputTypeA, Type *InputTypeB, Type *AccumType,
     ElementCount VF, TTI::PartialReductionExtendKind OpAExtend,
     TTI::PartialReductionExtendKind OpBExtend, std::optional<unsigned> BinOp,
-    TTI::TargetCostKind CostKind) const {
+    TTI::TargetCostKind CostKind, std::optional<FastMathFlags> FMF) const {
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MacDue wrote:

Is this missing a check for `if (Opcode == Instruction::FAdd)`?

https://github.com/llvm/llvm-project/pull/163975