patch 9.0.1842: Need more accurate profiling

Problem:  Need more accurate profiling
Solution: Improve profiling results

closes: #12192

Reduce overhead of checking if a function should be profiled,
by caching results of checking (which are done with regexp).

Cache uf_hash for uf_name in ufunc_T.

Cache cleared when regexps are changed.

Break at first match for has_profiling lookup.

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ernie Rael <errael@raelity.com>

src/vim9class.c

@@ -1475,6 +1475,7 @@ early_ret:
 
 	// Add the class to the script-local variables.
 	// TODO: handle other context, e.g. in a function
+	// TODO: does uf_hash need to be cleared?
 	typval_T tv;
 	tv.v_type = VAR_CLASS;
 	tv.vval.v_class = cl;