[PATCH] Optimize shufflevector that copies an i64/f64 and zeros the rest.

[Filipe Cabecinhas]

Hi nadav, craig.topper,

Also ran clang-format on the function. The coded added is the last else
if block.

http://reviews.llvm.org/D3518

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx-shuffle.ll
  test/CodeGen/X86/sse2.ll
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