rocr: Allow IPC signals in hsa_amd_signal_async_handler

Allow IPC signals to be registered with hsa_amd_signal_async_handler.
This forces AsyncEventsLoop to switch to polling instead of interrupts.

runtime/hsa-runtime/core/runtime/hsa_ext_amd.cpp

@@ -635,7 +635,9 @@ hsa_status_t hsa_amd_signal_async_handler(hsa_signal_t hsa_signal, hsa_signal_co
 
   core::Signal* signal = core::Signal::Convert(hsa_signal);
   IS_VALID(signal);
-  if (core::g_use_interrupt_wait && (!core::InterruptSignal::IsType(signal)))
+
+  if ((core::g_use_interrupt_wait && (!core::InterruptSignal::IsType(signal)) &&
+      !core::IPCSignal::IsType(signal)))
     return HSA_STATUS_ERROR_INVALID_SIGNAL;
   return core::Runtime::runtime_singleton_->SetAsyncSignalHandler(
       hsa_signal, cond, value, handler, arg);