[PATCH] D23798: [Instruction] Introduce a predicate mustOperandBeConstant()

[James Molloy via llvm-commits]

jmolloy created this revision.
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Some operands to instructions may not be variables. Examples are shufflevector masks,
GEP indices when the type is a struct and extractvalue indices.

As this blacklist is difficult to get right, promote it from a SimplifyCFG helper
function into Instruction proper.

Repository:
  rL LLVM

https://reviews.llvm.org/D23798

Files:
  include/llvm/IR/Instruction.h
  lib/IR/Instruction.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp

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