diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -1526,6 +1526,8 @@
   void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
                              llvm::Function *InitFunc, InitSegAttr *ISA);
 
+  void UpdateADOfGlobalCtors(llvm::Constant *Old, llvm::Constant *New);
+
   // FIXME: Hardcoding priority here is gross.
   void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
                      llvm::Constant *AssociatedData = nullptr);
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1421,6 +1421,14 @@
   return getModule().getNamedValue(Name);
 }
 
+void CodeGenModule::UpdateADOfGlobalCtors(llvm::Constant *Old, llvm::Constant *New) {
+  for(auto &S : GlobalCtors) {
+    if(S.AssociatedData == Old) {
+      S.AssociatedData = New;
+    }
+  }
+}
+
 /// AddGlobalCtor - Add a function to the list that will be called before
 /// main() runs.
 void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
@@ -3901,6 +3909,8 @@
       llvm::Constant *NewPtrForOldDecl =
           llvm::ConstantExpr::getBitCast(GV, Entry->getType());
       Entry->replaceAllUsesWith(NewPtrForOldDecl);
+
+      UpdateADOfGlobalCtors(Entry, GV);
     }
 
     Entry->eraseFromParent();