(adjust_markers_for_record_delete): Deleted.

(adjust_markers_for_record_delete): Deleted.
(adjust_markers_for_insert): Argument changed.  Caller changed.
(adjust_markers_for_replace): Likewise.
(ADJUST_CHAR_POS, combine_bytes, byte_combining_error,
CHECK_BYTE_COMBINING_FOR_INSERT): Deleted.
(copy_text): Delete unused local varialbe c_save.  For converting
to multibyte, be sure to make all 8-bit characters in valid
multibyte form.
(count_size_as_multibyte): Handle 8-bit characters correctly.
(insert_1_both, insert_from_string_1, insert_from_buffer_1,
adjust_after_replace, replace_range, del_range_2)
[BYTE_COMBINING_DEBUG]: Abort if byte combining occurs.
(insert_1_both, insert_from_string_1, insert_from_buffer_1,
adjust_after_replace, replace_range, del_range_2) Delete codes for
handling byte combining.
(adjust_before_replace): Deleted.