[PATCH] D136323: [ADT] Add APInt::isInvertOf

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The pattern is frequent enough to have its own implementation, which is
both more explicit and (slightly) faster than the default idiom.

Also use it to implement a faster llvm::KnownBits::isConstant() that doesn't
rely on popcnt.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136323

Files:
  llvm/include/llvm/ADT/APInt.h
  llvm/include/llvm/Support/KnownBits.h
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Support/APInt.cpp
  llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/Mips/MipsSEISelLowering.cpp
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
  llvm/unittests/ADT/APIntTest.cpp

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