[PATCH] [X86] tranform insertps to blendps when possible for better performance

[Sanjay Patel]

Updated patch to:

1. Only handle the low element to low element insertps case (immediate == 0)
2. Added test case to confirm that we're only transforming the low element insertps case
3. Removed use of 'auto'


http://reviews.llvm.org/D7866

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/avx-load-store.ll
  test/CodeGen/X86/sse41.ll

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