rocr: Fix error when internal signal is destroyed (#1845)

Fix error when we destroy internal signals during shutdown.
Fix init dependency on uninitialized value.

projects/rocr-runtime/runtime/hsa-runtime/core/inc/runtime.h

@@ -682,10 +682,10 @@ class Runtime {
   };
 
   struct AsyncEventsInfo {
+    bool monitor_exceptions;
     AsyncEventsControl control;
     AsyncEvents events;
     ConcurrentAsyncEvents new_events;
-    bool monitor_exceptions;
 
     AsyncEventsInfo(bool exceptions);
     ~AsyncEventsInfo();

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -2839,7 +2839,7 @@ void Runtime::AsyncEventsControl::Shutdown() {
   os::WaitForThread(thread_);
   os::CloseThread(thread_);
   thread_ = NULL;
-  HSA::hsa_signal_destroy(wake);
+  core::Signal::Convert(wake)->DestroySignal();
 }
 
 void Runtime::AsyncEvents::PushBack(hsa_signal_t signal,