tracing: Define new ftrace event "func_repeats"

The event aims to consolidate the function tracing record in the cases
when a single function is called number of times consecutively.

	while (cond)
		do_func();

This may happen in various scenarios (busy waiting for example).
The new ftrace event can be used to show repeated function events with
a single event and save space on the ring buffer

Link: https://lkml.kernel.org/r/[email protected]

Signed-off-by: Yordan Karadzhov (VMware) <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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