compiler/prog_item_stats.m:
New module to gather and print out statistics about items.
compiler/make_hlds_passes.m:
Invoke the new module if this module was compiled with a trace flag
that calls for this. (It is of course off by default.)
compiler/parse_tree.m:
Include the new module.
compiler/notes/compiler_design.html:
Document the new module, and improve the formatting of the documentation
of related modules.
tools/item_stats:
A new script to summarize the statistics gathered by prog_item_stats.m.
tools/sum_stats:
A much earlier version of that script, which may be useful in other
contexts.
