[PATCH] [X86][SSE] Improvements to byte shift shuffle matching

[Simon Pilgrim]

Hi chandlerc, qcolombet, andreadb, spatel,

Building on http://reviews.llvm.org/D5699

Since (v)pslldq / (v)psrldq instructions resolve to a single input argument it is useful to match it much earlier than we currently do - this prevents more complicated shuffles (notably insertion into a zero vector) matching before it.

http://reviews.llvm.org/D6409

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/combine-or.ll
  test/CodeGen/X86/vector-shuffle-128-v2.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-128-v8.ll
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