[SLP][REVEC] Fix InsertElement scalar type in getEntryCost When SLPReVec is enabled, getValueType returns the vector result type for InsertElement instructions rather than the scalar element type. This caused getEntryCost to propagate an incorrect ScalarTy (e.g. <4 x float> instead of float) into getScalarizationOverhead and getWidenedType, triggering an assertion failure and producing wrong cost estimates. Narrow ScalarTy to its element type when costing vectorized InsertElement entries whose inserted operands are scalars. Fixes #191175. Reviewers: Pull Request: https://github.com/llvm/llvm-project/pull/191628
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