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

src/compiler/linkage-impl.h

 // 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.
 
 #ifndef V8_COMPILER_LINKAGE_IMPL_H_
 #define V8_COMPILER_LINKAGE_IMPL_H_
 
 #include "src/code-stubs.h"
 #include "src/compiler/osr.h"
 
@@ skipping 120 matching lines @@
         types.Build(),                    // machine_sig
         locations.Build(),                // location_sig
         js_parameter_count,               // js_parameter_count
         properties,                       // properties
         kNoCalleeSaved,                   // callee-saved
         flags,                            // flags
         function->name);                  // debug name
   }
 
 
+  // TODO(all): Add support for return representations/locations to
+  // CallInterfaceDescriptor.
   // TODO(turbofan): cache call descriptors for code stub calls.
   static CallDescriptor* GetStubCallDescriptor(
       Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor,
       int stack_parameter_count, CallDescriptor::Flags flags,
-      Operator::Properties properties) {
+      Operator::Properties properties, MachineType return_type) {
     const int register_parameter_count =
         descriptor.GetEnvironmentParameterCount();
     const int js_parameter_count =
         register_parameter_count + stack_parameter_count;
     const int context_count = 1;
     const size_t return_count = 1;
     const size_t parameter_count =
         static_cast<size_t>(js_parameter_count + context_count);
 
     LocationSignature::Builder locations(zone, return_count, parameter_count);
     MachineSignature::Builder types(zone, return_count, parameter_count);
 
     // Add return location.
     AddReturnLocations(&locations);
-    types.AddReturn(kMachAnyTagged);
+    types.AddReturn(return_type);
 
     // Add parameters in registers and on the stack.
     for (int i = 0; i < js_parameter_count; i++) {
       if (i < register_parameter_count) {
         // The first parameters go in registers.
         Register reg = descriptor.GetEnvironmentParameterRegister(i);
         Representation rep =
             descriptor.GetEnvironmentParameterRepresentation(i);
         locations.AddParam(regloc(reg));
         types.AddParam(reptyp(rep));
@@ skipping 112 matching lines @@
     int parameter_index = 1 + index;  // skip index 0, which is the target.
     return incoming_->GetInputLocation(parameter_index);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_IMPL_H_