a68: introduce a68_add_global_decl and a68_global_context

Signed-off-by: Jose E. Marchesi <jemarch@gnu.org>

gcc/algol68/ChangeLog

	* a68.h: Add prototypes for a68_add_global_decl and
	a68_global_context.
	* a68-low-ranges.cc (a68_add_global_decl): New function.
	(a68_global_context): Likewise.
2 files changed