OSV-2020-1442 Segv on unknown address in clang::CXXRecordDecl::data

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19228 Crash type: Segv on unknown address Crash state: clang::CXXRecordDecl::data getDefaultInitValue EvaluateVarDecl...