invoke.texi: Mention -fdump-ada-spec.

invoke.texi: Mention -fdump-ada-spec.

	* doc/invoke.texi: Mention -fdump-ada-spec.
	* tree-dump.c (dump_files): Add ada-spec.
	(FIRST_AUTO_NUMBERED_DUMP): Bump to 8.
	* tree-pass.h (tree_dump_index): Add TDI_ada.
	* gcc.c: Add support for -C without -E and for -fdump-ada-spec.
	(cpp_unique_options): Do not reject -C or -CC when -E isn't present.
	(default_compilers) <@c-header>: Allow -fdump-ada-spec on header files.
	* c-decl.c: Include c-ada-spec.h.
	(collect_source_ref_cb, collect_all_refs, for_each_global_decl): New
	functions.
	(c_write_global_declarations): Add handling of -fdump-ada-spec.
	* c-lex.c (c_lex_with_flags): Add handling of CPP_COMMENT.
	* Makefile.in (C_AND_OBJC_OBJS): Add c-ada-spec.o.
	* c-ada-spec.h, c-ada-spec.c: New files.

Co-Authored-By: Matthew Gingell <gingell@adacore.com>
From-SVN: r160100