SCEV: Use AssertingVH to catch dangling BasicBlock* when passes forget

to notify SCEV of a change. Add forgetLoop in a couple of those places.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136797 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/include/llvm/Analysis/ScalarEvolution.h b/include/llvm/Analysis/ScalarEvolution.h
index fa9e402..c621bec 100644
--- a/include/llvm/Analysis/ScalarEvolution.h
+++ b/include/llvm/Analysis/ScalarEvolution.h
@@ -264,7 +264,7 @@ namespace llvm {
     /// ExitNotTakenInfo - Information about the number of times a particular
     /// loop exit may be reached before exiting the loop.
     struct ExitNotTakenInfo {
-      BasicBlock *ExitingBlock;
+      AssertingVH<BasicBlock> ExitingBlock;
       const SCEV *ExactNotTaken;
       PointerIntPair<ExitNotTakenInfo*, 1> NextExit;