[PATCH] [X86] For Silvermont CPU use 16-bit division instead of 64-bit for small positive numbers

[Alexey Volkov]

I created a test case. It's also included case for Atom processors.

http://reviews.llvm.org/D5938

Files:
  lib/Target/X86/X86.td
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86Subtarget.cpp
  lib/Target/X86/X86Subtarget.h
  test/CodeGen/X86/slow-div.ll
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