fix: don't ICE on LineOverflow when the line contains multibyte characters#6902

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rust-lang:mainrust-lang/rustfmt:mainfrom

shulaoda:05-22-fix_don_t_ice_on_lineoverflow_when_the_line_contains_multibyte_charactersshulaoda/rustfmt:05-22-fix_don_t_ice_on_lineoverflow_when_the_line_contains_multibyte_charactersCopy head branch name to clipboard