[PATCH] D141079: [SelectionDAG] Improve constant folding in the presence of SPLAT_VECTOR

[Luke Lau via Phabricator via llvm-commits]

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In order to fix a regression in WebAssembly introduced by D139871 <https://reviews.llvm.org/D139871>, allow
BITCASTs to constant fold if their operand is a SPLAT_VECTOR of a
constant.
Additionally, also provide the knowns bits for SPLAT_VECTOR in
SimplifyDemandedVectorElts


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141079

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/WebAssembly/pr59626.ll

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