OSV-2021-841 Heap-use-after-free in AK::StringImpl::create

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34973 Crash type: Heap-use-after-free READ Crash state: AK::StringImpl::create AK::String::String AK::URLParser::parsedataurl...