[PATCH] Model sqrtss as a binary operation with one source operand tied to the destination (PR14221)

[Sanjay Patel]

Hi hliao, rafael,

This is a continuation of r167064 ( http://llvm.org/viewvc/llvm-project?view=revision&revision=167064 ).
That patch started to fix PR14221 ( http://llvm.org/bugs/show_bug.cgi?id=14221 ), but was not completed, so we have a chunk of extra code that is preventing further improvements.

If everything looks ok here, I can submit a follow-on patch to fix sqrtsd (double-precision square root).

I'm not locating a Phab address for Manman Ren, so I'll send a follow-on mail.

http://reviews.llvm.org/D6330

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/sse_partial_update.ll
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