[llvm] [RISCV] Fix missing scaling by LMUL in cost model (PR #73342)

[via llvm-commits]

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@@ -1082,7 +1083,7 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
     // These all use the same code.
     auto LT = getTypeLegalizationCost(RetTy);
     if (!LT.second.isVector() && TLI->isOperationCustom(ISD::FCEIL, LT.second))
-      return LT.first * 8;
+      return LT.first * TLI->getLMULCost(LT.second) * 8;
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ShivaChen wrote:

Should only consider LMUL for vector type?

https://github.com/llvm/llvm-project/pull/73342