Added object comparability verification for context devices query (#2176)

Fixes #1485 according to work plan, point `CL_CONTEXT_DEVICES`

test_conformance/api/testBase.h

@@ -27,4 +27,24 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+// scope guard helper to ensure proper releasing of sub devices
+struct SubDevicesScopeGuarded
+{
+    SubDevicesScopeGuarded(const cl_int dev_count)
+    {
+        sub_devices.resize(dev_count);
+    }
+    ~SubDevicesScopeGuarded()
+    {
+        for (auto &device : sub_devices)
+        {
+            cl_int err = clReleaseDevice(device);
+            if (err != CL_SUCCESS)
+                log_error("\n Releasing sub-device failed \n");
+        }
+    }
+
+    std::vector<cl_device_id> sub_devices;
+};
+
 #endif // _testBase_h