[Dominators] Improve reachability verification
Summary:
This patch improves verification by making `verifyReachablility` look for CFG not found in the DomTree.
It also makes the verification work with postdominators by handling virtual root.
Reviewers: dberlin, davide, grosser, sanjoy
Reviewed By: dberlin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D35279
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307936 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed