[PATCH] [X86][SSE] psrl(w/d/q) and psll(w/d/q) bit shifts for SSE2

[Simon Pilgrim]

Merged left / right shift matching code into single predicate - I'm a little dubious as to whether the predicate is actually needed at this point....

Improved some byte shift tests as they were matching against bit shifts instead and we were losing test coverage.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6649

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/combine-or.ll
  test/CodeGen/X86/vec_insert-5.ll
  test/CodeGen/X86/vector-idiv.ll
  test/CodeGen/X86/vector-shuffle-128-v16.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-128-v8.ll
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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