[PATCH] [x86] Begin a significant overhaul of how vector lowering is done in the x86 backend.

[Chandler Carruth]

Fix up comments and add another assert based on Filipe's comments.

http://reviews.llvm.org/D4225

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-128-v16.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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