Wrap ClassLiterals in DoExpressions instead of giving them BlockScopes.

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index a238eacd11a9599ef48836e24bed7e6285245cb6..85bf2f6d9497875c1428cf3815cd26239ae97c05 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -475,10 +475,18 @@ class DoExpression final : public Expression {
   void set_block(Block* b) { block_ = b; }
   VariableProxy* result() { return result_; }
   void set_result(VariableProxy* v) { result_ = v; }
+  FunctionLiteral* represented_function() { return represented_function_; }
+  void set_represented_function(FunctionLiteral* f) {
+    represented_function_ = f;
+  }
+  bool IsAnonymousFunctionDefinition() const;
 
  protected:
   DoExpression(Zone* zone, Block* block, VariableProxy* result, int pos)
-      : Expression(zone, pos, kDoExpression), block_(block), result_(result) {
+      : Expression(zone, pos, kDoExpression),
+        block_(block),
+        result_(result),
+        represented_function_(nullptr) {
     DCHECK_NOT_NULL(block_);
     DCHECK_NOT_NULL(result_);
   }
@@ -489,6 +497,7 @@ class DoExpression final : public Expression {
 
   Block* block_;
   VariableProxy* result_;
+  FunctionLiteral* represented_function_;
 };
 
 
@@ -2716,7 +2725,6 @@ class ClassLiteral final : public Expression {
 
   DECLARE_NODE_TYPE(ClassLiteral)
 
-  Scope* scope() const { return scope_; }
   VariableProxy* class_variable_proxy() const { return class_variable_proxy_; }
   Expression* extends() const { return extends_; }
   void set_extends(Expression* e) { extends_ = e; }
@@ -2752,18 +2760,13 @@ class ClassLiteral final : public Expression {
   FeedbackVectorSlot PrototypeSlot() const { return prototype_slot_; }
   FeedbackVectorSlot ProxySlot() const { return proxy_slot_; }
 
-  bool IsAnonymousFunctionDefinition() const {
-    return constructor()->raw_name()->length() == 0;
-  }
-
  protected:
-  ClassLiteral(Zone* zone, Scope* scope, VariableProxy* class_variable_proxy,
+  ClassLiteral(Zone* zone, VariableProxy* class_variable_proxy,
                Expression* extends, FunctionLiteral* constructor,
                ZoneList<Property*>* properties, int start_position,
                int end_position)
       : Expression(zone, start_position, kClassLiteral),
         end_position_(end_position),
-        scope_(scope),
         class_variable_proxy_(class_variable_proxy),
         extends_(extends),
         constructor_(constructor),
@@ -2777,7 +2780,6 @@ class ClassLiteral final : public Expression {
   int end_position_;
   FeedbackVectorSlot prototype_slot_;
   FeedbackVectorSlot proxy_slot_;
-  Scope* scope_;
   VariableProxy* class_variable_proxy_;
   Expression* extends_;
   FunctionLiteral* constructor_;
@@ -3458,14 +3460,13 @@ class AstNodeFactory final BASE_EMBEDDED {
         false);
   }
 
-  ClassLiteral* NewClassLiteral(Scope* scope, VariableProxy* proxy,
-                                Expression* extends,
+  ClassLiteral* NewClassLiteral(VariableProxy* proxy, Expression* extends,
                                 FunctionLiteral* constructor,
                                 ZoneList<ObjectLiteral::Property*>* properties,
                                 int start_position, int end_position) {
     return new (local_zone_)
-        ClassLiteral(local_zone_, scope, proxy, extends, constructor,
-                     properties, start_position, end_position);
+        ClassLiteral(local_zone_, proxy, extends, constructor, properties,
+                     start_position, end_position);
   }
 
   NativeFunctionLiteral* NewNativeFunctionLiteral(const AstRawString* name,