[PATCH] D119150: [SDAG] move x86 select-with-identity-constant fold behind a target hook; NFC

[Sanjay Patel via Phabricator via llvm-commits]

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This is no-functional-change-intended because only the x86 target enables the TLI hook currently.

We can add fmul/fdiv opcodes to the switch similar to the proposal D119111 <https://reviews.llvm.org/D119111>, but we don't need to make other changes like enabling target-specific combines.

We can also add integer opcodes (add, or, shl, etc.) to the switch because this function is called from all of the generic opcodes.


https://reviews.llvm.org/D119150

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h

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