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Dan Gohman
b08ba8824e
don't visit all blocks in the function, and don't iterate over the split blocks' predecessor lists for each block visited. Also, remove the special-case test for the entry block. Splitting the entry block isn't common enough to make this worthwhile. This fixes a major compile-time bottleneck which is exposed now that LoopSimplify isn't being redundantly run both before and after DominanceFrontier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109408 91177308-0d34-0410-b5e6-96231b3b80d8
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