[PATCH] D151631: [InstSimplify] Simplify select i1 ConstExpr, i1 true, i1 false to ConstExpr

[luxufan via Phabricator via llvm-commits]

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`select i1 non-const, i1 true, i1 false` has been optimized to
`non-const`. There is no reason that we can not optimize `select i1
ConstExpr, i1 true, i1 false` to `ConstExpr`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151631

Files:
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/test/Transforms/InstSimplify/select-inseltpoison.ll
  llvm/test/Transforms/InstSimplify/select.ll

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