PR c++/16518
	PR c++/16337
	* decl.c (grokvardecl): Make declspecs parameter const.
	(grokdeclarator): Likewise.  Adjust accordingly.
	* decl.h (grokdeclarator): Adjust declaration.
	* parser.c (cp_parser_init_declarator): Do not clear
	decl_specifiers->attributes.

	PR c++/16518
	* g++.dg/parse/mutable1.C: New test.

From-SVN: r84646