Wrap ClassLiterals in DoExpressions instead of giving them BlockScopes.

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 6fa7f53071f14286dd0442f61c74c644607e57ad..a2fc8997a4a07be151afd82ac4c6de0016c762e7 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -141,8 +141,8 @@ bool Expression::IsValidReferenceExpressionOrThis() const {
 bool Expression::IsAnonymousFunctionDefinition() const {
   return (IsFunctionLiteral() &&
           AsFunctionLiteral()->IsAnonymousFunctionDefinition()) ||
-         (IsClassLiteral() &&
-          AsClassLiteral()->IsAnonymousFunctionDefinition());
+         (IsDoExpression() &&
+          AsDoExpression()->IsAnonymousFunctionDefinition());
 }
 
 void Expression::MarkTail() {
@@ -155,6 +155,12 @@ void Expression::MarkTail() {
   }
 }
 
+bool DoExpression::IsAnonymousFunctionDefinition() const {
+  // This is specifically to allow DoExpressions to represent ClassLiterals.
+  return represented_function_ != nullptr &&
+         represented_function_->raw_name()->length() == 0;
+}
+
 bool Statement::IsJump() const {
   switch (node_type()) {
 #define JUMP_NODE_LIST(V) \