OSV-2020-1473 Segv on unknown address in LValue::addUnsizedArray

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19704 Crash type: Segv on unknown address Crash state: LValue::addUnsizedArray PointerExprEvaluator::VisitCastExpr clang::StmtVisitorBase::Visit...