[PATCH] [mips] Add the following MIPS options that control gp-relative addressing of small data items: -mgpopt, -mlocal-sdata, -mextern-sdata.

[Sasa Stankovic]

Added comment why zero-sized objects are not treated as small data.

http://reviews.llvm.org/D4903

Files:
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.h
  lib/Target/Mips/MipsSubtarget.cpp
  lib/Target/Mips/MipsTargetObjectFile.cpp
  lib/Target/Mips/MipsTargetObjectFile.h
  test/CodeGen/Mips/gprel.ll
  test/CodeGen/Mips/small-section-reserve-gp.ll
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