[perl #80548] Add the stash name to DTrace probes

[perl #80548] Add the stash name to DTrace probes

This adds an additional parameter to perl's dtrace probes with the stash
name of the subroutine. This generally looks nicer than the filename but
gives a similar level of context.

As this is an additional parameter this will not have an impact on
existing DTrace scripts. (Also due to the way DTrace works I believe it
does not break binary compatibility and would be safe to backport to
maint-5.12 if desired, but I'm not a DTrace expert.)