[PATCH] Use broadcasts to optimize overall size when loading constant splat vectors (x86-64 with AVX or AVX2)

[Sanjay Patel]

Use patterns (thanks, Elena!) instead of code to handle just the cases we want to optimize for size. 

With this patch, the actual code changed is only in the 2 'if' statements that guard the generation of the VBROADCAST node.

http://reviews.llvm.org/D5347

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrSSE.td
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