Faster invocation of custom comparator function.

src/arm/codegen-arm.h

Index: src/arm/codegen-arm.h
diff --git a/src/arm/codegen-arm.h b/src/arm/codegen-arm.h
index c1201804a99651f0575cc3d57f281d9f731ec0ff..40bae7eab5c00a38c15d2752a0fb84ec178e8a0e 100644
--- a/src/arm/codegen-arm.h
+++ b/src/arm/codegen-arm.h
@@ -404,6 +404,9 @@ class CodeGenerator: public AstVisitor {
   // Fast support for number to string.
   void GenerateNumberToString(ZoneList<Expression*>* args);
 
+  // Fast call for custom callbacks.
+  void GenerateCallFunction(ZoneList<Expression*>* args);
+
   // Fast call to math functions.
   void GenerateMathPow(ZoneList<Expression*>* args);
   void GenerateMathSin(ZoneList<Expression*>* args);