tokenizer: Fix index-out-of-bounds on unfinished unicode escapes before EOF #9809
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Follow up to #9808, pretty much the same bug but with char literals (also found via fuzzing).
Turns out these were the only other crashes found by the fuzzer, they were just being repeated a ton so I thought there'd be a lot more fixes necessary. The tokenizer fuzzer is now running cleanly so far with these fixes.