* cpphash.h (struct cpp_buffer): Remove saved_line_base.
	* cpptrad.c: Update comments.
	(skip_whitespace, copy_comment): Take a new parameter.
	(skip_escaped_newlines): Don't duplicate escaped newline test.
	(copy_comment): Different location for CUR, decide here how
	to copy / replace the comment.
	(skip_whitespace): Copy whitespace.
	(_cpp_overlay_buffer, _cpp_remove_overlay): Don't play with line_base.
	(scan_out_logical_line): Let copy comment handle keeping or
	replacing comments.
	(scan_parameters, _cpp_create_trad_definition): Update.

From-SVN: r54605