cp-tree.h (lang_decl_slector): New enum.

cp-tree.h (lang_decl_slector): New enum.

	* cp-tree.h (lang_decl_slector): New enum.
	(lang_decl_base): Make selector an enum.  Drop decomposition_p
	field.
	(lang_decl): Use enum for discrimination.
	(LANG_DECL_FN_CHECK, LANG_DECL_NS_CHECK, LANG_DECL_PARM_CHECK,
	LANG_DECL_DEOMP_CHECK): Use enum.
	(DECL_DECOMPOSITION_P): Use selector value.
	(SET_DECL_DECOMPOSITION_P): Delete.
	(retrofit_lang_decl): Lose SEL parm.
	(fit_decomposition_lang_decl): Declare.
	* decl.c (cp_finish_decomp, grokdeclarator): Use
	fit_decomposition_lang_decl.
	* lex.c (maybe_add_lang_decl_raw): New. Broken out of
	retrofit_lang_decl.
	(set_decl_linkage): New.  Broken out of retrofit_lang_decl.  Use
	enum.
	(fit_decomposition_lang_decl): Likewise.
	(retrofit_lang_decl): Use worker functions.
	(cxx_dup_lang_specific_decl): Use selector enum.
	(maybe_add_lang_type_raw): New.  Broken out of ...
	(cxx_make_type_name): ... here.  Call it.

From-SVN: r248748