Introduce AllocateInNewSpace stub.

src/ppc/interface-descriptors-ppc.cc

Index: src/ppc/interface-descriptors-ppc.cc
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 4286f8bf6d2a2becb89bacdb043c65aae5c63ebd..193e7d60518c80e720e2e21437facd8900cb913d 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -220,6 +220,13 @@ void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
 }
 
 
+void AllocateInNewSpaceDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {r3};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state