[PATCH] D121869: [WebAssembly] Disable SimplifyDemandedVectorElts after legalization

[Heejin Ahn via Phabricator via llvm-commits]

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This fixes a reported bug that caused an infinite loop during the
SelectionDAG optimization phase in ISel, by creating an overridable hook
in `TargetLowering` that allows us to bail out from running
`SimplifyDemandedVectorElts`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121869

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h
  llvm/test/CodeGen/WebAssembly/simd-simplify-demanded-vector-elts.ll

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