Force clock sync on profiling enablement

Fix a condition where we can get a divide-by-zero in the
TranslateTime(tick) function if the GPU tick predates HSA
startup and we did not do a SyncClocks since initialization.

Change-Id: I0dcec8553ccb8f01211928991f4b3ed3cb4a1ebb

runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -1034,6 +1034,12 @@ hsa_status_t GpuAgent::EnableDmaProfiling(bool enable) {
     }
   }
 
+  // If we did not update t1 since agent initialization, force a SyncClock. Otherwise computing
+  // the SystemClockCounter to GPUClockCounter ratio in TranslateTime(tick) results to a division
+  // by 0. We perform the check here because we do not want to check everytime there is a call to
+  // TranslateTime(tick)
+  if (enable && t0_.GPUClockCounter == t1_.GPUClockCounter) SyncClocks();
+
   return HSA_STATUS_SUCCESS;
 }