[PATCH] Add support for small-model PIC for PowerPC.

[Justin Hibbits]

Update the patch to only switch on 'PICLevel::Small', so that the default PIC level is large-model.  This way, if no PIC level is specified in the module flags it will always default to Large-model, rather than the current undefined.

http://reviews.llvm.org/D5399

Files:
  include/llvm/MC/MCExpr.h
  include/llvm/Support/ELF.h
  lib/MC/MCExpr.cpp
  lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp
  lib/Target/PowerPC/PPCAsmPrinter.cpp
  lib/Target/PowerPC/PPCISelDAGToDAG.cpp
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCInstrInfo.td
  test/CodeGen/PowerPC/ppc32-pic-large.ll
  test/CodeGen/PowerPC/ppc32-pic.ll
  test/CodeGen/PowerPC/sections.ll
  test/CodeGen/PowerPC/tls-pic.ll
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