[stubs] Introduce ToNameStub to implement %_ToName.

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index d8067898e5e8dfcfcbd64262bcff5618a202820f..0fd2b83fd2bb8b4a04ca45851893ee930cf98798 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -121,6 +121,10 @@ const Register ToStringDescriptor::ReceiverRegister() { return rax; }
 
 
 // static
+const Register ToNameDescriptor::ReceiverRegister() { return rax; }
+
+
+// static
 const Register ToObjectDescriptor::ReceiverRegister() { return rax; }