[PATCH] Added more insertps optimizations

[Filipe Cabecinhas]

Hi delena, nadav, craig.topper,

When inserting an element that's coming from a vector load or a broadcast
of a vector (or scalar) load, combine the load into the insertps
instruction.

Added test cases.

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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