* cpphash.h (struct cpp_buffer): Remove backup_to.
	* cpplex.c (BACKUP, get_effective_char): Die.
	(_cpp_skip_block_comment): Assume '*' is location on entry.
	(continues_identifier_p): Respect -fno-dollars-in-identifiers.
	(IF_NEXT_IS): Update.
	(_cpp_lex_direct): Don't use backup_to; look ahead directly.

From-SVN: r65819