[PATCH] Optimize long branch for MIPS64 by removing calculation of %higher and %highest

[Sasa Stankovic]

  Additionally optimize long branch for MIPS64 by removing one more instruction.

Hi mseaborn, dsanders,

http://reviews.llvm.org/D3281

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3281?vs=8386&id=8581#toc

Files:
  lib/Target/Mips/Mips64InstrInfo.td
  lib/Target/Mips/MipsAsmPrinter.cpp
  lib/Target/Mips/MipsLongBranch.cpp
  lib/Target/Mips/MipsMCInstLower.cpp
  lib/Target/Mips/MipsMCInstLower.h
  test/CodeGen/Mips/longbranch.ll
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