Merging r181423:
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r181423 | hfinkel | 2013-05-08 05:16:14 -0700 (Wed, 08 May 2013) | 5 lines

PPCInstrInfo::optimizeCompareInstr should not optimize FP compares

The floating-point record forms on PPC don't set the condition register bits
based on a comparison with zero (like the integer record forms do), but rather
based on the exception status bits.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@181507 91177308-0d34-0410-b5e6-96231b3b80d8