Plan 9 from Bell Labs’s /usr/web/sources/contrib/gabidiaz/root/sys/src/cmd/perl/ext/Devel/DProf/Todo

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- work on test suite.
- localize the depth to guard against non-local exits.
Current overhead (with PERLDBf_NONAME) wrt non-debugging run (estimates):
	 8% extra call frame on DB::sub
	 7% output of subroutine data
	70% output of timing data (on OS/2, 35% with custom dprof_times())
(Additional 17% are spent to write the output, but they are counted
 and subtracted.)  

With compensation for DProf overhead all but some odd 12% are subtracted ?!

- Calculate overhead/count for XS calls and Perl calls separately.
- goto &XSUB in pp_ctl.c;

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