[PATCH] [X86] Improved lowering of v4x32 build_vector dag nodes.

[Andrea Di Biagio]

Uploaded a new version of the patch.
This time we correctly check the precondition on the number of non-zero elements in input to the build_vector.
Also, added a missing check on the value type of vectors in input to extract_vector_elt dag nodes.

http://reviews.llvm.org/D6311

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sse2.ll
  test/CodeGen/X86/sse41.ll
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