Correctify instanceof and make it optimizable.

src/interface-descriptors.cc

Index: src/interface-descriptors.cc
diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc
index 35a152b79872e19474ebd654e2fcb0fbe14c7333..913847bc13a6aebf6706cf75c62d264c39987d75 100644
--- a/src/interface-descriptors.cc
+++ b/src/interface-descriptors.cc
@@ -155,9 +155,9 @@ void StoreGlobalViaContextDescriptor::InitializePlatformSpecific(
 }
 
 
-void InstanceofDescriptor::InitializePlatformSpecific(
+void InstanceOfDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
-  Register registers[] = {left(), right()};
+  Register registers[] = {LeftRegister(), RightRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }