(Qeight_bit_control, Qeight_bit_graphic): New

variables.
(SPLIT_CHARACTER_SEQ): This macro deleted.
(SPLIT_MULTIBYTE_SEQ): Assume that multibyte sequence at STR is
valid.
(CHAR_COMPONENTS_VALID_P): Handle new charsets; eight-bit-control
and eight-bit-graphic.
(char_to_string): Likewise.  Signal an error for too large
character code.
(char_printable_p): Return 0 for 8-bit characters.
(update_charset_table): Update iso_charset_table only when a final
character is non-negative.
(find_charset_in_text): Renamed from find_charset_in_str.
Arguments and return value changed.  Callers changed.
(Fdefine_charset): Args ISO-FINAL-CHAR and ISO-GRAPHIC-PLANE can
be -1 if CHARSET is used only internally.
(Fmake_char_internal): Handle new charsets; eight-bit-control and
eight-bit-graphic.
(Fcharset_after): Simplified.
(char_valid_p): Use SPLIT_CHAR, not SPLIT_NON_ASCII_CHAR.
(char_bytes): Return 2 for chars of the range 0xA0..0xFF.
(multibyte_chars_in_text): Simplified by assuming there's no
invalid multibyte sequence.
(parse_str_as_multibyte, str_as_multibyte, str_to_multibyte,
str_as_unibyte): New functions.
(Fstring): Simpified by assuming that byte combining never
happens.
(init_charset_once): Initialization for
LEADING_CODE_8_BIT_CONTROL.
(syms_of_charset): Intern and staticpro Qeight_bit_control and
Qeight_bit_graphic.  Include them in Vcharset_list.  Make charsets
eight-bit-control and eight-bit-graphic.

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