* c-parse.in (yylexname): New function, split out of _yylex.
	(objc_rid_sans_at): New table.
	(init_reswords): Initialize it.
	(_yylex): Give labels clearer names.  Handle CPP_ATSIGN by
	retrieving the next token and checking it for significance as
	an ObjC keyword or string constant.

	* cpplex.c (_cpp_lex_token): Just return CPP_ATSIGN for '@'.
	* cpplib.h (TTYPE_TABLE): Add CPP_ATSIGN, drop CPP_OSTRING.

	* c-lex.c, c-parse.in, cppmacro.c, cpplex.c, cp/spew.c: Remove
	references to CPP_OSTRING.

From-SVN: r40279