Wrap ClassLiterals in DoExpressions instead of giving them BlockScopes.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 4ab075e052c48070a5814ab1b5c4dfbf5d57817a..91c8a3a294846207ab2427f5018238de4f397e81 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -582,11 +582,11 @@ class ParserTraits {
       const ParserFormalParameters& parameters, FunctionKind kind,
       FunctionLiteral::FunctionType function_type, bool* ok);
 
-  ClassLiteral* ParseClassLiteral(Type::ExpressionClassifier* classifier,
-                                  const AstRawString* name,
-                                  Scanner::Location class_name_location,
-                                  bool name_is_strict_reserved, int pos,
-                                  bool* ok);
+  Expression* ParseClassLiteral(Type::ExpressionClassifier* classifier,
+                                const AstRawString* name,
+                                Scanner::Location class_name_location,
+                                bool name_is_strict_reserved, int pos,
+                                bool* ok);
 
   V8_INLINE void MarkCollectedTailCallExpressions();
   V8_INLINE void MarkTailPosition(Expression* expression);
@@ -1002,11 +1002,11 @@ class Parser : public ParserBase<ParserTraits> {
       int function_token_position, FunctionLiteral::FunctionType type,
       LanguageMode language_mode, bool* ok);
 
-  ClassLiteral* ParseClassLiteral(ExpressionClassifier* classifier,
-                                  const AstRawString* name,
-                                  Scanner::Location class_name_location,
-                                  bool name_is_strict_reserved, int pos,
-                                  bool* ok);
+  Expression* ParseClassLiteral(ExpressionClassifier* classifier,
+                                const AstRawString* name,
+                                Scanner::Location class_name_location,
+                                bool name_is_strict_reserved, int pos,
+                                bool* ok);
 
   // Magical syntax support.
   Expression* ParseV8Intrinsic(bool* ok);