[ORC] De-register eh-frames in the RTDyldObjectLinkingLayer destructor.

This matches the behavior of the legacy layer, which automatically deregistered
frames.

llvm/include/llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h

@@ -54,6 +54,8 @@ public:
   RTDyldObjectLinkingLayer(ExecutionSession &ES,
                            GetMemoryManagerFunction GetMemoryManager);
 
+  ~RTDyldObjectLinkingLayer();
+
   /// Emit the object.
   void emit(MaterializationResponsibility R,
             std::unique_ptr<MemoryBuffer> O) override;

llvm/lib/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.cpp

@@ -78,6 +78,12 @@ RTDyldObjectLinkingLayer::RTDyldObjectLinkingLayer(
     ExecutionSession &ES, GetMemoryManagerFunction GetMemoryManager)
     : ObjectLayer(ES), GetMemoryManager(GetMemoryManager) {}
 
+RTDyldObjectLinkingLayer::~RTDyldObjectLinkingLayer() {
+  std::lock_guard<std::mutex> Lock(RTDyldLayerMutex);
+  for (auto &MemMgr : MemMgrs)
+    MemMgr->deregisterEHFrames();
+}
+
 void RTDyldObjectLinkingLayer::emit(MaterializationResponsibility R,
                                     std::unique_ptr<MemoryBuffer> O) {
   assert(O && "Object must not be null");