Add AssertingVH which makes PR7647 break consistently.

llvm-svn: 108401

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index dbefc2dedb2..0efe183a998 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -443,7 +443,9 @@ void llvm::ReplaceAndSimplifyAllUses(Instruction *From, Value *To,
   // FromHandle - This keeps a weakvh on the from value so that we can know if
   // it gets deleted out from under us in a recursive simplification.
   WeakVH FromHandle(From);
-  
+  // Double-check that To isn't deleted.
+  AssertingVH<> CheckedTo = To;
+
   while (!From->use_empty()) {
     // Update the instruction to use the new value.
     Use &U = From->use_begin().getUse();