[llvm] [SLP] More accurately cost RISCV scalar splats (PR #213104)

[Alexey Bataev via llvm-commits]

================
@@ -14479,12 +14496,14 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
       });
       InstructionCost InsertCost =
           TTI.getVectorInstrCost(Instruction::InsertElement, VecTy, CostKind, 0,
-                                 PoisonValue::get(VecTy), *It);
+                                 PoisonValue::get(VecTy), *It, ContextHint);
       return InsertCost + getShuffleCost(TTI, TargetTransformInfo::SK_Broadcast,
                                          VecTy, CostKind, ShuffleMask,
                                          /*Index=*/0, /*SubTp=*/nullptr,
-                                         /*Args=*/*It);
+                                         /*Args=*/*It, ContextHint);
     }
+    assert(ContextHint != TTI::VectorInstrContext::SplatOpFolded &&
+           "Expected SplatOpFolder to be a splat");
----------------
alexey-bataev wrote:

```suggestion
           "Expected SplatOpFolded to be a splat");
```

https://github.com/llvm/llvm-project/pull/213104