MINOR: activity: interrupt the show profile dump more often

MINOR: activity: interrupt the show profile dump more often

The calls to resolv_sym_name() can be a bit expensive. Forcing to
yield more often is better for the latency and will avoid the
watchdog reporting warnings.

Note that it's still called in the sort at the end, but that one
cannot be avoided. At best we could try to rely on the list of libs
but that's not trivial and not always present.