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Commit 95a80abe authored by Evgeniy Stepanov's avatar Evgeniy Stepanov
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Optimize tree walking in markAliveBlocks. 

Check whether a BB is known as reachable before adding it to the worklist.
This way BB's with multiple predecessors are added to the list no more than
once.

llvm-svn: 170335
parent 51bf1b26
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