Introduce AllocateInNewSpace stub.

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 c323a2d5dba402651aa3b47ffb5ffbe78e520e67..0457cb4ac213431663e49e77c1901b25c40355d1 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -221,6 +221,13 @@ void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
 }
 
 
+void AllocateInNewSpaceDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {rax};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state