rocr: Disable WaitAny() in AsyncEventsLoop()

- Add the new path to avoid WaitAny() calls  in AsyncEventsLoopp() with
HSA_WAIT_ANY_DEBUG key. The new path is selected by default.
The optimizaiton combines all logic of WaitAny() in a single processing loop
and avoids extra memory allocations or ref counting.  Also it won't spin
on the CPU if all events are busy.

Change-Id: I197ce60d0d023fbb672f700d6e87702686f1f55a

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

@@ -556,6 +556,8 @@ class Runtime {
     std::vector<hsa_signal_condition_t> cond_;
     std::vector<hsa_signal_value_t> value_;
     std::vector<hsa_amd_signal_handler> handler_;
+    std::vector<HsaEvent*> hsa_events_; //!< A list of HSA events for KFD wait
+    std::vector<uint64_t> age_;         //!< The age list for KFD wait
     std::vector<void*> arg_;
   };
 

runtime/hsa-runtime/core/inc/signal.h

@@ -379,6 +379,12 @@ class Signal {
   /// @brief Checks if signal is currently in use by a wait API.
   bool InWaiting() const { return waiting_ != 0; }
 
+  /// @brief Increments the waiting indicator.
+  void WaitingInc() { waiting_++; }
+
+  /// @brief Decrements the waiting indicator.
+  void WaitingDec() { waiting_--; }
+
   // Prep for copy profiling.  Store copy agent and ready API block.
   __forceinline void async_copy_agent(core::Agent* agent) {
     async_copy_agent_ = agent;