[turbofan] Address a couple of Type-related TODOs.

src/compiler/js-global-object-specialization.cc

 // Copyright 2015 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/compiler/js-global-object-specialization.h"
 
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-graph.h"
@@ skipping 102 matching lines @@
     ReplaceWithValue(node, value);
     return Replace(value);
   }
 
   // Load from constant type cell can benefit from type feedback.
   Type* property_cell_value_type = Type::NonInternal();
   MachineRepresentation representation = MachineRepresentation::kTagged;
   if (property_details.cell_type() == PropertyCellType::kConstantType) {
     // Compute proper type based on the current value in the cell.
     if (property_cell_value->IsSmi()) {
-      property_cell_value_type = type_cache_.kSmi;
+      property_cell_value_type = Type::SignedSmall();
       representation = MachineRepresentation::kTaggedSigned;
     } else if (property_cell_value->IsNumber()) {
-      // TODO(mvstanton): Remove kHeapNumber from type cache, it's just
-      // Type::Number().
-      property_cell_value_type = type_cache_.kHeapNumber;
+      property_cell_value_type = Type::Number();
       representation = MachineRepresentation::kTaggedPointer;
     } else {
       // TODO(turbofan): Track the property_cell_value_map on the FieldAccess
       // below and use it in LoadElimination to eliminate map checks.
       Handle<Map> property_cell_value_map(
           Handle<HeapObject>::cast(property_cell_value)->map(), isolate());
       property_cell_value_type = Type::For(property_cell_value_map);
       representation = MachineRepresentation::kTaggedPointer;
     }
   }
@@ skipping 141 matching lines @@
   return jsgraph()->javascript();
 }
 
 SimplifiedOperatorBuilder* JSGlobalObjectSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8