Make the virtual destructor out-of-line so we have a key function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128964 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

@@ -29,6 +29,9 @@
 using namespace llvm;
 using namespace llvm::object;
 
+// Empty out-of-line virtual destructor as the key function.
+RTDyldMemoryManager::~RTDyldMemoryManager() {}
+
 namespace llvm {
 class RuntimeDyldImpl {
   unsigned CPUType;