configure.host: If the CPU provides atomic builtins select generic/atomic_builtins/atomicity.h.

2006-05-27  Paolo Carlini  <pcarlini@suse.de>

	* configure.host: If the CPU provides atomic builtins select
	generic/atomic_builtins/atomicity.h.
	* config/cpu/generic/atomic_builtins/atomicity.h: Add.
	* config/cpu/powerpc/atomicity.h: Remove.
	* config/cpu/ia64/atomicity.h: Likewise.
	* config/cpu/alpha/atomicity.h: Likewise.
	* config/cpu/s390/atomicity.h: Likewise.

From-SVN: r114155