[PATCH] [PowerPC] Fix __tls_get_addr sequence to avoid register assignment issues

[Bill Schmidt]

Rebased patch provided.  I've bootstrapped with -O2, -O3, -O3 -DNDEBUG, and -O3 -DNDEBUG -mcpu=native.  However, those tests were on a http://reviews.llvm.org/P8.  Hal, I'd appreciate it if you could apply to your http://reviews.llvm.org/P7 and see if you run into any issues this time.

Thanks,
Bill


http://reviews.llvm.org/D7491

Files:
  lib/Target/PowerPC/CMakeLists.txt
  lib/Target/PowerPC/PPC.h
  lib/Target/PowerPC/PPCAsmPrinter.cpp
  lib/Target/PowerPC/PPCFrameLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstr64Bit.td
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCMCInstLower.cpp
  lib/Target/PowerPC/PPCTLSDynamicCall.cpp
  lib/Target/PowerPC/PPCTargetMachine.cpp
  test/CodeGen/PowerPC/retaddr2.ll
  test/CodeGen/PowerPC/tls-cse.ll
  test/CodeGen/PowerPC/tls-store2.ll

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