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

[Sanjay Patel]

Patch rebased and added possible movddup return value to function-level comment.

http://reviews.llvm.org/D5347

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/splat-for-size.ll
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