[PATCH] [x86] remove RCPPS and RSQRTPS intrinsic instruction definitions

[Sanjay Patel]

Hi craig.topper, delena, RKSimon, andreadb,

Unless I'm missing some unique use case of (V)RCPPS / (V)RSQRTPS, we don't need codegen-only intrinsic instructions for these.

This makes the reciprocal estimate instruction lowering identical to how we handle (V)SQRTPS / (V)SQRTPD. 

No existing regression tests fail with this patch.

http://reviews.llvm.org/D9301

Files:
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrSSE.td
  lib/Target/X86/X86IntrinsicsInfo.h

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