[PATCH] D16380: Introduce ConstantFoldCastOperand function and migrate some callers of ConstantFoldInstOperands to use it. NFC.

[Manuel Jacob via llvm-commits]

mjacob created this revision.
mjacob added a reviewer: eddyb.
mjacob added subscribers: llvm-commits, dblaikie.

Although this is a slight cleanup on its own, the main motivation is to
enable further simplifications to the constant folding API.

All remaining ConstantFoldInstOperands callers simplify an instruction,
and can be changed to use ConstantFoldInstruction instead.  This will be
done in follow-up commits.

http://reviews.llvm.org/D16380

Files:
  include/llvm/Analysis/ConstantFolding.h
  lib/Analysis/ConstantFolding.cpp
  lib/Analysis/InstructionSimplify.cpp
  lib/CodeGen/MachineFunction.cpp

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