OSV-2020-893 Heap-buffer-overflow in hermes::parser::JSLexer::consumeBracedCodePoint

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23725 Crash type: Heap-buffer-overflow READ 1 Crash state: hermes::parser::JSLexer::consumeBracedCodePoint hermes::parser::JSLexer::consumeUnicodeEscape hermes::parser::JSLexer::advance...