C++: Avoid looking ahead when lexing u8"literal"
This makes things slightly more efficient. But it will be more significant when we introduce R"rawliterals" since we would avoid an even further lookahead for cases like u8R"string". Change-Id: Id4bad8b917752d23daf2f4989330434979cf602f Reviewed-by: Roberto Raggi <email@example.com> Reviewed-by: hjk <firstname.lastname@example.org>
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