[xemacs-hg @ 2007-09-04 21:20:18 by aidan] Eliminate a crash when profiling; only pass the backtrace record to profile_record_about_to_call, profile_record_just_called when it's non-nil.

This directory contains the source code for the architecture-dependent
files that go in ../arch-lib.  At present, these are mostly utility
programs used by Emacs.