Added Signals; more runtime fixes

src/core/hle/service/gsp/gsp_gpu.cpp

@@ -824,10 +824,6 @@ std::unique_ptr<Kernel::SessionRequestHandler::SessionDataBase> GSP_GPU::MakeSes
     return std::make_unique<SessionData>(this);
 }
 
-SessionData::SessionData() {
-    UNREACHABLE();
-}
-
 SessionData::SessionData(GSP_GPU* gsp) : gsp(gsp) {
     // Assign a new thread id to this session when it connects. Note: In the real GSP service this
     // is done through a real thread (svcCreateThread) but we have to simulate it since our HLE

src/core/hle/service/gsp/gsp_gpu.h

@@ -187,7 +187,7 @@ class GSP_GPU;
 
 class SessionData : public Kernel::SessionRequestHandler::SessionDataBase {
 public:
-    SessionData();
+    SessionData() = default;
     SessionData(GSP_GPU* gsp);
     ~SessionData();
 

src/core/hle/service/ldr_ro/ldr_ro.cpp

@@ -15,6 +15,7 @@
 
 SERVICE_CONSTRUCT_IMPL(Service::LDR::RO)
 SERIALIZE_EXPORT_IMPL(Service::LDR::RO)
+SERIALIZE_EXPORT_IMPL(Service::LDR::ClientSlot)
 
 namespace Service::LDR {