Parse arrow functions at proper precedence level

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 11dc456e3dba721637e06a9283906a6db530255c..044b904bdff78bb0a31e6ddc42826082e47f6f16 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2867,6 +2867,12 @@ void AstGraphBuilder::VisitSpread(Spread* expr) {
 }
 
 
+void AstGraphBuilder::VisitEmptyParentheses(EmptyParentheses* expr) {
+  // Handled entirely by the parser itself.
+  UNREACHABLE();
+}
+
+
 void AstGraphBuilder::VisitThisFunction(ThisFunction* expr) {
   Node* value = GetFunctionClosure();
   ast_context()->ProduceValue(value);