[PATCH] [X86] 8bit divrem: Improve codegen for AH register extraction.

[Ahmed Bougacha]

Remove support for 64-bit sexts: those are impossible from h-regs.

I had previously added a subreg_to_reg to also support i64 extensions for free. But I just had a flash where I remembered that we still need to explicitly movsx to a 64-bit register.

While there, remove useless ops vectors.

http://reviews.llvm.org/D6064

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  lib/Target/X86/X86InstrExtension.td
  test/CodeGen/X86/divrem8_ext.ll
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