[PATCH] Added llvm.is.constant intrinsic

[Janusz Sobczak]

Moved lowering llvm.is.constant to False from LegalizeDAG to SelectionDAG. Code to promote or expand llvm.is.constant is not required any more and the intrinsic works fine with different input integer types.

http://reviews.llvm.org/D4276

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/IR/Intrinsics.td
  include/llvm/Target/TargetSelectionDAG.td
  lib/Analysis/ConstantFolding.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  test/CodeGen/Generic/inline-is-constant.ll
  test/CodeGen/Generic/is-constant.ll
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