[PATCH] Expand BuildPairF64 by spilling to stack slot and reloading from it

[Sasa Stankovic]

Hi dsanders,

[mips] For fpxx and when mthc1 is not available, expand BuildPairF64 by spilling to stack slot and reloading from it.

http://reviews.llvm.org/D4465

Files:
  lib/Target/Mips/MipsSEFrameLowering.cpp
  lib/Target/Mips/MipsSubtarget.h
  test/CodeGen/Mips/fpxx.ll
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