SWDEV-480209 - Handle GraphExec object release

=> GraphExec instance is destroyed before async launch completes,
destroy after all pending graph launches
=> Remove GraphExec destroy during next sync point(hipStreamSync,
hipDeviceSync etc..)

Change-Id: I4df682aae5787fd6e5240a7be936ce50361345d0

hipamd/src/hip_device.cpp

@@ -274,8 +274,6 @@ void Device::SyncAllStreams( bool cpu_wait) {
   }
   // Release freed memory for all memory pools on the device
   ReleaseFreedMemory();
-  // Release all graph exec objects destroyed by user.
-  ReleaseGraphExec(hip::getCurrentDevice()->deviceId());
 }
 
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