[stubs] Add missing interface descriptor for the CompareIC.

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 f82d85ded01dd39752ee8b0497798c3220bf5e75..01d01503403b9ccc97fb5773db8609fca614546a 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -227,6 +227,12 @@ void InternalArrayConstructorDescriptor::Initialize(
 }
 
 
+void CompareDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {cp, r4, r3};
+  data->Initialize(arraysize(registers), registers, NULL);
+}
+
+
 void CompareNilDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {cp, r3};
   data->Initialize(arraysize(registers), registers, NULL);