Write a "test-profile" that does echo client-server with threads;
	profile reveals lock contention, memcpy/realloc of buffers, and
	UTF-8 validation as hot spots. 20% of lock contention eliminated
	with dbus_atomic_inc/dec implementation on x86.  Much remaining
	contention is global mempool locks for GList and DBusList.

	* dbus/dbus-sysdeps.c (_dbus_atomic_inc, _dbus_atomic_dec): add
	x86 implementation

	* dbus/dbus-connection.c (struct DBusConnection): use
	dbus_atomic_t for the reference count

	* dbus/dbus-message.c (struct DBusMessage): declare
	dbus_atomic_t values as volatile

	* configure.in: code to detect ability to use atomic integer
	operations in assembly, from GLib patch

	* dbus/dbus-internals.c (_dbus_verbose_real): call getpid every
	time, tired of it being wrong in threads and forked processes

	* glib/test-profile.c: a little program to bounce messages back
	and forth between threads and eat CPU

	* dbus/dbus-connection.c: add debug spew macros for debugging
	thread locks; include config.h at top; fix deadlock in
	dbus_connection_flush()