tree dd1b8a8dc92414a57e563be7c38b3d63be04faaf
parent 7c0face4555a9e0409910b87154ff4d2b4826ca2
author Dan Gohman <gohman@apple.com> 1323718945 +0000
committer Dan Gohman <gohman@apple.com> 1323718945 +0000

When computing reverse-CFG reverse-post-order, skip backedges, as
detected in the forward-CFG DFS. This prevents the reverse-CFG from
visiting blocks inside loops after blocks that dominate them in the
case where loops have multiple exits.

No testcase, because this fixes a bug which in practice only shows
up in a full optimizer run, due to the use-list order.

This fixes rdar://10422791 and others.

llvm-svn: 146408