[stubs] Introduce ToNameStub to implement %_ToName.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 4411ae169a46f8367230b8344a65580f49d0ea76..8a43ec13a66e47aa14aa0ce6535d0bbc8895979c 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -28,6 +28,7 @@ class PlatformInterfaceDescriptor;
   V(ToNumber)                                 \
   V(ToLength)                                 \
   V(ToString)                                 \
+  V(ToName)                                   \
   V(ToObject)                                 \
   V(NumberToString)                           \
   V(Typeof)                                   \
@@ -405,6 +406,16 @@ class ToStringDescriptor : public CallInterfaceDescriptor {
 };
 
 
+class ToNameDescriptor : public CallInterfaceDescriptor {
+ public:
+  enum ParameterIndices { kReceiverIndex };
+
+  DECLARE_DESCRIPTOR(ToNameDescriptor, CallInterfaceDescriptor)
+
+  static const Register ReceiverRegister();
+};
+
+
 class ToObjectDescriptor : public CallInterfaceDescriptor {
  public:
   enum ParameterIndices { kReceiverIndex };