Evgeniy Stepanov 1794814198 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170335 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-17 14:28:00 +00:00
..
2012-07-24 10:51:42 +00:00