Extend ExecutePM4() to accept completion signal and fences

ExecutePM4() function can optionally accept extra arguments for
acquire fence scope, release fence scope andcompletion signal. When
a completion signal is provided, ExecutePM4() does not wait for the
commands to complete.

Change-Id: Ib2a433b7bce1cb6260be8b76fe902335bd5dfada

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

@@ -152,7 +152,10 @@ class HostQueue : public Queue {
     return HSA_STATUS_ERROR_INVALID_QUEUE;
   }
 
-  void ExecutePM4(uint32_t* cmd_data, size_t cmd_size_b) override {
+  void ExecutePM4(uint32_t* cmd_data, size_t cmd_size_b,
+                  hsa_fence_scope_t acquireFence = HSA_FENCE_SCOPE_NONE,
+                  hsa_fence_scope_t releaseFence = HSA_FENCE_SCOPE_NONE,
+                  hsa_signal_t* signal = NULL) override {
     assert(false && "HostQueue::ExecutePM4 is unimplemented");
   }