Correctify instanceof and make it optimizable.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index a016797623a4331fdec2acab881d2899898f84ba..11820ef594f2952b9cb1b71e78862e61020bb117 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -19,7 +19,7 @@ class PlatformInterfaceDescriptor;
   V(StoreTransition)                          \
   V(VectorStoreICTrampoline)                  \
   V(VectorStoreIC)                            \
-  V(Instanceof)                               \
+  V(InstanceOf)                               \
   V(LoadWithVector)                           \
   V(FastNewClosure)                           \
   V(FastNewContext)                           \
@@ -268,13 +268,13 @@ class StoreTransitionDescriptor : public StoreDescriptor {
 };
 
 
-class InstanceofDescriptor : public CallInterfaceDescriptor {
+class InstanceOfDescriptor final : public CallInterfaceDescriptor {
  public:
-  DECLARE_DESCRIPTOR(InstanceofDescriptor, CallInterfaceDescriptor)
+  DECLARE_DESCRIPTOR(InstanceOfDescriptor, CallInterfaceDescriptor)
 
   enum ParameterIndices { kLeftIndex, kRightIndex, kParameterCount };
-  static const Register left();
-  static const Register right();
+  static const Register LeftRegister();
+  static const Register RightRegister();
 };