Added support for hipCtxSynchronize and hipCtxGetFlags,modified hipDeviceSynchronize

Change-Id: If7bac667a262fa8c0cb3dc93e97f2534855acd07


[ROCm/hip commit: a498753041]

projects/hip/src/hip_hcc.cpp

@@ -158,7 +158,14 @@ ihipCtx_t *ihipGetTlsDefaultCtx()
     return tls_defaultCtx;
 }
 
+hipError_t ihipSynchronize(void)
+{
+    HIP_INIT_API();
 
+    ihipGetTlsDefaultCtx()->locked_waitAllStreams(); // ignores non-blocking streams, this waits for all activity to finish.
+
+    return ihipLogStatus(hipSuccess);
+}
 
 //=================================================================================================
 // ihipSignal_t: