* gengtype.c (create_option): New function.
	* gengtype.h: Prototype it.
	* gengtype-yacc.y (stringseq): New rule.
	(option): Use create_option.  Add new bare ID production.  Use
	stringseq, not STRING directly.

	* alias.c, bitmap.c, c-decl.c, cgraph.h, cpplib.h, cselib.h
	* dwarf2out.c, emit-rtl.c, function.h, lists.c, tree.h
	* varray.h, config/alpha/alpha.c, cp/name-lookup.c, cp/parser.c
	* f/com.c, java/builtins.c, java/expr.c, java/jcf.h, java/parse.h:
	Use new shorter form of GTY markers.

	* doc/gty.texi: Rewrite.

From-SVN: r80091