* regex.c (RE_TARGET_MULTIBYTE_P): New macro.

* regex.c (RE_TARGET_MULTIBYTE_P): New macro.
(GET_CHAR_BEFORE_2): Check target_multibyte, not multibyte.  If
that is zero, convert an eight-bit char to multibyte.
(MAKE_CHAR_MULTIBYTE, CHAR_LEADING_CODE): New dummy new macros for
non-emacs case.
(PATFETCH): Convert an eight-bit char to multibyte.
(HANDLE_UNIBYTE_RANGE): New macro.
(regex_compile): Setup the compiled pattern for multibyte chars
even if the given regex string is unibyte.  Use PATFETCH_RAW
instead of PATFETCH in many places.  To handle `charset'
specification of unibyte, call HANDLE_UNIBYTE_RANGE.   Use bitmap
only for ASCII chars.
(analyse_first) <exactn>: Simplified because the compiled pattern
is multibyte.
<charset_not>: Setup fastmap from bitmap only for ASCII chars.
<charset>: Use CHAR_LEADING_CODE to get leading codes.
<categoryspec>: If multibyte, setup fastmap only for ASCII chars
here.
(re_compile_fastmap) [emacs]: Call analyse_first with the arg
multibyte always 1.
(re_search_2) In emacs, set the locale variable multibyte to 1,
otherwise to 0.  New local variable target_multibyte.  Check it
to decide the multibyteness of STR1 and STR2.  If
target_multibyte is zero, convert unibyte chars to multibyte
before translating and checking fastmap.
(TARGET_CHAR_AND_LENGTH): New macro.
(re_match_2_internal): In emacs, set the locale variable multibyte
to 1, otherwise to 0.  New local variable target_multibyte.  Check
it to decide the multibyteness of STR1 and STR2.  Use
TARGET_CHAR_AND_LENGTH to fetch a character from D.
<charset, charset_not>: If multibyte is nonzero, check fastmap
only for ASCII chars.   Call bcmp_translate with
target_multibyte, not with multibyte.
<begline>: Declare the local variable C as `unsigned'.
(bcmp_translate): Change the last arg name to target_multibyte.