[PATCH] Optimization for certain shufflevector by using insertps.

[Filipe Cabecinhas]

Added the optimization for v4i32 (but we emit pinsrd instead of insertps when loading from memory).
Addresses the concerns in the review, except for the load minimization, due to discussion on IRC, existing optimizations that reduce load sizes, and lack of response to my question.

http://reviews.llvm.org/D3475

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