[turbofan] Work-around untagged result of CompareIC in pointer maps.

src/compiler/ppc/linkage-ppc.cc

Index: src/compiler/ppc/linkage-ppc.cc
diff --git a/src/compiler/ppc/linkage-ppc.cc b/src/compiler/ppc/linkage-ppc.cc
index 38117222a9a0d9e2ef398d0aefeb072fc48ae590..39ebb63efa3b59a7dccac5b604521809606d2f3b 100644
--- a/src/compiler/ppc/linkage-ppc.cc
+++ b/src/compiler/ppc/linkage-ppc.cc
@@ -53,9 +53,10 @@ CallDescriptor* Linkage::GetRuntimeCallDescriptor(
 CallDescriptor* Linkage::GetStubCallDescriptor(
     Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor,
     int stack_parameter_count, CallDescriptor::Flags flags,
-    Operator::Properties properties) {
+    Operator::Properties properties, MachineType return_type) {
   return LH::GetStubCallDescriptor(isolate, zone, descriptor,
-                                   stack_parameter_count, flags, properties);
+                                   stack_parameter_count, flags, properties,
+                                   return_type);
 }