add a way to register an arbitrary cleanup function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34442 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/ManagedStatic.h

@@ -73,6 +73,12 @@ public:
   }
 };
 
+template<void (*CleanupFn)(void*)>
+class ManagedCleanup : public ManagedStaticBase {
+public:
+  void Register() { RegisterManagedStatic(0, CleanupFn); }
+};
+
 
 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
 void llvm_shutdown();