Toplevel Makefile: really build tools.
tools/Makefile: build per-lang directories by default.
tools/Makefile.allocsites: omit redundant directory creation commands.
Use the total version of get_object_memory_kind in malloc_usable_size wrapper, to avoid sometimes misclassifying stack addresses.
merge-allocs.sh: don't include obsolete private bash function file (oops).
Merge.