Index: lib/CodeGen/CodeGenModule.h
===================================================================
--- lib/CodeGen/CodeGenModule.h
+++ lib/CodeGen/CodeGenModule.h
@@ -1202,10 +1202,10 @@
                      llvm::Constant *AssociatedData = nullptr);
   void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
 
-  /// Generates a global array of functions and priorities using the given list
-  /// and name. This array will have appending linkage and is suitable for use
-  /// as a LLVM constructor or destructor array.
-  void EmitCtorList(const CtorList &Fns, const char *GlobalName);
+  /// EmitCtorList - Generates a global array of functions and priorities using
+  /// the given list and name. This array will have appending linkage and is
+  /// suitable for use as a LLVM constructor or destructor array. Clears Fns.
+  void EmitCtorList(CtorList &Fns, const char *GlobalName);
 
   /// Emit any needed decls for which code generation was deferred.
   void EmitDeferred();
Index: lib/CodeGen/CodeGenModule.cpp
===================================================================
--- lib/CodeGen/CodeGenModule.cpp
+++ lib/CodeGen/CodeGenModule.cpp
@@ -720,7 +720,7 @@
   GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
 }
 
-void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
+void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
   // Ctor function type is void()*.
   llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
   llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
@@ -748,6 +748,7 @@
                              llvm::ConstantArray::get(AT, Ctors),
                              GlobalName);
   }
+  Fns.clear();
 }
 
 llvm::GlobalValue::LinkageTypes