[PATCH] Fix shift by constants for vector.

[Matt Arsenault]

ashr <N x iM>, <N x iM> M -> undef

This used to only happen for scalars.

http://llvm-reviews.chandlerc.com/D2990

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineShifts.cpp
  test/Transforms/InstCombine/shift.ll
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