cp:
	PR c++/18095
	* parser.c (eof_token): Make const, correctly initialize rid and
	location fields.
	(struct cp_lexer): Replace buffer_end pointer with buffer_length
	count. Adjust.
	(cp_lexer_new_main): Directly grow lexer's buffer here.  Don't
	zero it out.
	(cp_lexer_new_from_tokens): Adjust.
	(cp_lexer_grow_buffer): Remove.
	(cp_lexer_peek_nth_token, cp_lexer_consume_token,
	cp_lexer_purge_token): Add const casts.
testsuite:
	PR c++/18095
	* g++.dg/parse/crash18.C: New.
	* g++.dg/parse/crash19.C: New.

From-SVN: r89439