[PATCH] [X86] Canonicalize various patterns to vector extloads.

[Ahmed Bougacha]

Now that we can specify legality of extloads, there's no need to have 5 different ways of expressing it.

Followup of D6125, D6533.

http://reviews.llvm.org/D6896

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/vector-sext.ll

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