Parse arrow functions at proper precedence level

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index 8b71eb7f9d08ad398695d9f8c74893a887faa320..1017b3185ba11845436f9213b97b98e770544cbc 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -1399,6 +1399,11 @@ void FullCodeGenerator::ExitTryBlock(int handler_index) {
 void FullCodeGenerator::VisitSpread(Spread* expr) { UNREACHABLE(); }
 
 
+void FullCodeGenerator::VisitEmptyParentheses(EmptyParentheses* expr) {
+  UNREACHABLE();
+}
+
+
 FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit(
     int* stack_depth, int* context_length) {
   // The macros used here must preserve the result register.