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On PowerPC, which has a full set of logical operations on (its multiple sets of) condition-register bits, it is not profitable to break of complex conditions feeding a jump into multiple jumps. We can turn off this feature of CGP/SDAGBuilder by marking jumps as "expensive". P7 test-suite speedups (no regressions): MultiSource/Benchmarks/FreeBench/pcompress2/pcompress2 -0.626647% +/- 0.323583% MultiSource/Benchmarks/Olden/power/power -18.2821% +/- 8.06481% git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228895 91177308-0d34-0410-b5e6-96231b3b80d8
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