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(looking_at_1): Use bytepos to call re_search_2.

Convert search regs to charpos, if search succeeded.
(search_buffer): Likewise.  Also convert charpos <-> bytepos
in non-regexp case.
(scan_buffer): Convert charpos <-> bytepos.
(scan_newline): New function.
(find_next_newline): Function deleted.
(set_search_regs): Args now in bytes; convert to charpos.
(Freplace_match): Convert charpos <-> bytepos when scanning case.