[PATCH] [ConstantRange] Add an exact version of makeICmpRegion.

[Sanjoy Das]

Address Nick's comments: split make makeICmpRegion into
makeAllowedICmpRegion and makeSatisfyingICmpRegion with clearly
specified contracts.


http://reviews.llvm.org/D8345

Files:
  include/llvm/IR/ConstantRange.h
  lib/Analysis/LazyValueInfo.cpp
  lib/IR/ConstantRange.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  unittests/IR/ConstantRangeTest.cpp

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