Add a separate end_event_dyn() that takes a std::string by value for
dynamic event names. The [=] lambda capture deep-copies the string into
the closure, avoiding a dangling pointer when the Trace() continuation
runs after the caller's stack frame is gone.
The existing end_event() with const char* remains for string literals
and long-lived pointers (e.g. payload->str), where no copy is needed.
CREATE_DUAL_EVENT_CALLBACK_DYN formats the event name via snprintf and
passes the result as a std::string to end_event_dyn(). Follow-up patches
will use this macro to label events with runtime dimensions.
Signed-off-by: Michael Cheng <michael.cheng@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41374>
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