Jakob Stoklund Olesen a59ce03791 Use a reverse post order instead of a DFS order.
The enterBasicBlock() function is combining live-out values from
predecessor blocks.  The RPO traversal means that more predecessors
have been visited when that happens, only back-edges are missing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144025 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-07 21:59:29 +00:00
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