Faster invocation of custom comparator function.

src/arm/virtual-frame-arm.h

Index: src/arm/virtual-frame-arm.h
diff --git a/src/arm/virtual-frame-arm.h b/src/arm/virtual-frame-arm.h
index 6ba1eecc01905308cd06767ed29fb1f3d2f13c2c..f301aebf0c40c30d7da1659ecfcae9b208491775 100644
--- a/src/arm/virtual-frame-arm.h
+++ b/src/arm/virtual-frame-arm.h
@@ -266,6 +266,10 @@ class VirtualFrame : public ZoneObject {
     masm()->CallStub(stub);
   }
 
+  // Call JS function from top of the stack with arguments
+  // taken from the stack.
+  void CallJSFunction(int arg_count);
+
   // Call runtime given the number of arguments expected on (and
   // removed from) the stack.
   void CallRuntime(Runtime::Function* f, int arg_count);