PR9604; try to deal with RAUW updates correctly in the AST. I'm not convinced

it's completely safe to cache the AST across LICM runs even with this fix,
but this fix can't hurt.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129198 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/AliasSetTracker.cpp

@@ -602,6 +602,10 @@ void AliasSetTracker::ASTCallbackVH::deleted() {
   // this now dangles!
 }
 
+void AliasSetTracker::ASTCallbackVH::allUsesReplacedWith(Value *V) {
+  AST->copyValue(getValPtr(), V);
+}
+
 AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
   : CallbackVH(V), AST(ast) {}