debugmalloc() - dumps information on malloc'd memory to a file.
void debugmalloc( string filename, int mask );
This efun is only available when DEBUGMALLOC and DEBUGMALLOC_EXTENSIONS
are both defined in options.h at driver build time. The debugmalloc()
efun will dump information on those chunks of memory allocated by DMAL‐
LOC() and related macros if the mask bitwise and'd (&) with the tag
supplied by the macro (i.e. (mask & tag)) is non-zero. Read md.c and
config.h in the driver source for more information.