[PATCH] [IR] Fix the definition of 'shl nsw'

[David Majnemer]

Hi rsmith, nicholas, nlewycky, sanjoy,

Provide a definition for 'shl nsw' which makes it compatible with 'mul nsw'.

http://reviews.llvm.org/D8890

Files:
  docs/LangRef.rst
  lib/Analysis/InstructionSimplify.cpp
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  test/Transforms/InstCombine/2011-06-13-nsw-alloca.ll
  test/Transforms/InstCombine/cast.ll
  test/Transforms/InstSimplify/compare.ll

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