Two small cleanups/speedups:
* Do not insert a new entry into NewPhiNodes during the rename pass if there are no PHIs in a block. * Do not compute WriteSets in parallel llvm-svn: 8858
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* Do not insert a new entry into NewPhiNodes during the rename pass if there are no PHIs in a block. * Do not compute WriteSets in parallel llvm-svn: 8858