Im trying to reduce memory used by
internal tables built into DYNAMIC_DEBUG
the main savings available is in the per pr_debug*
callsite data: modname, filename, funcname.
I have segregated those fields to a new __dyndbg_sites section,
described by struct _ddebug_site, and now refd by new ptr in
struct _ddebug
That new ptr enlarges the memory footprint, so I want to replace it
with an integer index into the section / array. Existing padding could hold the index.
To use the index, I need &dyndbg_sites[], and that only works
for builtin-module's callsites. For loaded modules, I can/have
added a pointer to the section into module load_info, giving me
the base I will need for the ! builtin branch.
I just need a not expensive is-it-builtin (modref)
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