event classes is the only operation that is permitted
on a frozen stream class.
+This function tries to resolve the needed
+\link ctfirfieldtypes CTF IR field type\endlink of the dynamic field
+types that are found anywhere in the context or payload field
+types of \p event_class. If any automatic resolving fails:
+
+- If the needed field type should be found in one of the root field
+ types of \p event_class or \p stream_class, this function fails.
+- If \p stream_class is the child of a
+ \link ctfirtraceclass CTF IR trace class\endlink (it was added
+ with bt_ctf_trace_add_stream_class()), this function fails.
+- If \p stream_class is not the child of a trace class yet, the
+ automatic resolving is reported to the next call to
+ bt_ctf_trace_add_stream_class() with \p stream_class.
+
@param[in] stream_class Stream class to which to add \p event_class.
@param[in] event_class Event class to add to \p stream_class.
@returns 0 on success, or a negative value on error.