[PATCH] D137635: [CodeGen] Add sources to isVectorClearMaskLegal. NFC.

[Han-Kuan Chen via Phabricator via llvm-commits]

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Targets may require source information to know whether a mask is legal.
(e.g., whether sources are from a same vector). But current
isVectorClearMaskLegal only provides mask and value type, which is not
enough.

Because DAG.getBitcast may add use number of operand (which blocks some
optimization), we will remove the bitcast node if the node is not used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137635

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h

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