[PATCH] D158590: [RISCV] Fix assertion of getShuffleCost

[Wang Pengcheng via Phabricator via llvm-commits]

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This assertion is introduced by D157425 <https://reviews.llvm.org/D157425>.

We should calculate the cost iff `Mask` is not empty.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158590

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/test/Transforms/SLPVectorizer/RISCV/vecreduce.ll

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