acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Check for set of all used __sync builtins, in two sizes.

2008-04-24  Benjamin Kosnik  <bkoz@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Check for set of
	all used __sync builtins, in two sizes.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* src/atomic.cc: Use  _GLIBCXX_ATOMIC_BUILTINS_1.
	* include/ext/atomicity.h: Use  _GLIBCXX_ATOMIC_BUILTINS_4.
	* libsupc++/guard.cc: Use  _GLIBCXX_ATOMIC_BUILTINS_4.
	* doc/xml/manual/concurrency.xm: Update docs.

From-SVN: r134629