* langhooks.h (builtin_function): New langhook.
	* langhooks-def.h (LANG_HOOKS_BUILTIN_FUNCTION): New.
	(LANG_HOOKS_INITIALIZER): Update.
	* tree.h (builtin_function): Remove.
	* doc/tm.texi: Update.
	* c-tree.h (builtin_function): Declare.
	* c-common.c, config/alpha/alpha.c, config/arm/arm.c,
	config/c4x/c4x.c, config/frv/frv.c, config/i386/i386.c,
	config/ia64/ia64.c, config/iq2000/iq2000.c,
	config/rs6000/rs6000.c, config/s390/s390.c, config/sh/sh.c,
	config/stormy16/stormy16.c: All callers of builtin_function
	changed.

ada:
	* gigi.h (builtin_function): Declare.

cp:
	* cp-tree.h (builtin_function): Declare.

fortran:
	* trans.h (builtin_function): Declare.

java:
	* java-tree.h (builtin_function): Declare.

From-SVN: r84878