Wrap ClassLiterals in DoExpressions instead of giving them BlockScopes.

src/parsing/pattern-rewriter.cc

Index: src/parsing/pattern-rewriter.cc
diff --git a/src/parsing/pattern-rewriter.cc b/src/parsing/pattern-rewriter.cc
index e00403135a18dc4d0309a00589fb8b8001150c4e..807ac4bc23ab61a8dc6305eefdc483a6c633ff89 100644
--- a/src/parsing/pattern-rewriter.cc
+++ b/src/parsing/pattern-rewriter.cc
@@ -393,7 +393,8 @@ void Parser::PatternRewriter::RewriteParameterScopes(Expression* expr) {
   DCHECK(scope()->outer_scope()->is_function_scope());
   DCHECK(scope()->calls_sloppy_eval());
 
-  ReparentParameterExpressionScope(parser_->stack_limit(), expr, scope());
+  ReparentParameterExpressionScope(parser_->stack_limit(), expr,
+                                   scope()->outer_scope(), scope());
 }
 
 void Parser::PatternRewriter::VisitObjectLiteral(ObjectLiteral* pattern,