Merging r205630:

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r205630 | hfinkel | 2014-04-04 11:15:57 -0400 (Fri, 04 Apr 2014) | 6 lines

[PowerPC] Add a full condition code register to make the "cc" clobber work

gcc inline asm supports specifying "cc" as a clobber of all condition
registers. Add just enough modeling of the full register to make this work.
Fixed PR19326.

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llvm-svn: 205908