PPC: Use a stub in crankshaft for grow store arrays.

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 01d01503403b9ccc97fb5773db8609fca614546a..0fe70f27317afdcb1cac0774885088e04a0bdf83 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -54,6 +54,11 @@ const Register MathPowIntegerDescriptor::exponent() {
 }
 
 
+const Register GrowArrayElementsDescriptor::ObjectRegister() { return r3; }
+const Register GrowArrayElementsDescriptor::KeyRegister() { return r6; }
+const Register GrowArrayElementsDescriptor::CapacityRegister() { return r5; }
+
+
 void FastNewClosureDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {cp, r5};
   data->Initialize(arraysize(registers), registers, NULL);