-Wdeprecated-clean: Fix cases of violating the rule of 5 in ways that are deprecated in C++11

LoadedObjectInfo was depending on the implicit copy ctor in the presence
of a user-declared dtor. Default (and protect) it in the base class and
make the devired classes final to avoid any risk of a public API that
would enable slicing.

llvm-svn: 244112
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
index e2979a6..338724d 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
@@ -24,7 +24,7 @@
 
 namespace {
 
-class LoadedCOFFObjectInfo
+class LoadedCOFFObjectInfo final
     : public RuntimeDyld::LoadedObjectInfoHelper<LoadedCOFFObjectInfo> {
 public:
   LoadedCOFFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)