[PATCH] Fix testing for undefined behavior in vector shift tests.

[Matt Arsenault]

Most of these were all shifting the same amount as the bitwidth, and some were doing 0 shifts. These break when I fix DAGCombiner to understand shifts by constant vectors.

http://llvm-reviews.chandlerc.com/D2991

Files:
  test/CodeGen/AArch64/neon-shl-ashr-lshr.ll
  test/CodeGen/ARM/vshift.ll
  test/CodeGen/ARM/vsra.ll
  test/CodeGen/X86/avx2-vector-shifts.ll
  test/CodeGen/X86/sse2-vector-shifts.ll
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