Heejin Ahn b8038a916d [WebAssembly] Disable SimplifyDemandedVectorElts after legalization ...

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`.

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D121869

2022-03-16 20:52:43 -07:00

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