OSV-2020-790 Use-of-uninitialized-value in clang::tok::isAnnotation

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18444 Crash type: Use-of-uninitialized-value Crash state: clang::tok::isAnnotation clang::TokenLexer::Lex clang::Preprocessor::Lex...