[stubs] Unify the type conversion call interface descriptors.

src/interface-descriptors.cc

Index: src/interface-descriptors.cc
diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc
index f89fd5c13d450c6e94198e9619ae0753c74d342e..c7288c0d8cfe1c82bc096a73e0e91bb4f55a118f 100644
--- a/src/interface-descriptors.cc
+++ b/src/interface-descriptors.cc
@@ -197,31 +197,9 @@ void StringCompareDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
-void ToLengthDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {ReceiverRegister()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
-void ToStringDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {ReceiverRegister()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
-void ToNameDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {ReceiverRegister()};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
-void ToObjectDescriptor::InitializePlatformSpecific(
+void TypeConversionDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
-  Register registers[] = {ReceiverRegister()};
+  Register registers[] = {ArgumentRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }