[PATCH] Optimization for certain shufflevector by using insertps.

[Filipe Cabecinhas]

Hi nadav,

If we're doing a v4f32 shuffle on x86 with SSE4.1, we can lower certain
shufflevectors to an insertps instruction:
When most of the shufflevector result's elements come from one vector (and
keep their index), and one element comes from another vector or a memory
operand.

Added tests for insertps optimizations on shufflevector.

http://reviews.llvm.org/D3475

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sse41.ll
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