[PATCH] Fully fix Bug #22115.

[Justin Hibbits]

Hi hfinkel,

In the previous commit, the register was saved, but space was not allocated.
This resulted in the parameter save area potentially clobbering r30, leading to
nasty results.

http://reviews.llvm.org/D6906

Files:
  lib/Target/PowerPC/PPCFrameLowering.cpp
  lib/Target/PowerPC/PPCMachineFunctionInfo.h
  test/CodeGen/PowerPC/ppc32-pic-large.ll
  test/CodeGen/PowerPC/ppc32-pic.ll

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