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

src/compiler/ppc/linkage-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/assembler.h"
 #include "src/code-stubs.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/linkage-impl.h"
 #include "src/zone.h"
 
@@ skipping 35 matching lines @@
     Zone* zone, Runtime::FunctionId function, int parameter_count,
     Operator::Properties properties) {
   return LH::GetRuntimeCallDescriptor(zone, function, parameter_count,
                                       properties);
 }
 
 
 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);
 }
 
 
 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
                                                   const MachineSignature* sig) {
   return LH::GetSimplifiedCDescriptor(zone, sig);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8