OSV-2020-824 UNKNOWN READ in std::__1::_MetaBase<__can_be_converted_to_string_view<char, std::__1::char_trait

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24057 Crash type: UNKNOWN READ Crash state: std::1::MetaBase, std::1::allocator std::1::treeiteratorstd::1::valuetypestd::1::basicstringchar, st...