[PATCH] Added more insertps optimizations

[Filipe Cabecinhas]

Pinging the patch, but also added a CHECK-NOT to a test.

Changed CHECK to CHECK-NOT instead of removing.

http://reviews.llvm.org/D3581

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/fold-load-vec.ll
  test/CodeGen/X86/sse41.ll
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