[turbofan] Utilize maps from field type tracking to eliminate map checks.

src/compiler/js-create-lowering.cc

 // Copyright 2016 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-create-lowering.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 1168 matching lines @@
   ZoneVector<std::pair<FieldAccess, Node*>> inobject_fields(zone());
   inobject_fields.reserve(boilerplate_map->GetInObjectProperties());
   int const boilerplate_nof = boilerplate_map->NumberOfOwnDescriptors();
   for (int i = 0; i < boilerplate_nof; ++i) {
     PropertyDetails const property_details =
         boilerplate_map->instance_descriptors()->GetDetails(i);
     if (property_details.type() != DATA) continue;
     Handle<Name> property_name(
         boilerplate_map->instance_descriptors()->GetKey(i), isolate());
     FieldIndex index = FieldIndex::ForDescriptor(*boilerplate_map, i);
-    FieldAccess access = {
-        kTaggedBase, index.offset(),           property_name,
-        Type::Any(), MachineType::AnyTagged(), kFullWriteBarrier};
+    FieldAccess access = {kTaggedBase,      index.offset(),
+                          property_name,    MaybeHandle<Map>(),
+                          Type::Any(),      MachineType::AnyTagged(),
+                          kFullWriteBarrier};
     Node* value;
     if (boilerplate->IsUnboxedDoubleField(index)) {
       access.machine_type = MachineType::Float64();
       access.type = Type::Number();
       value = jsgraph()->Constant(boilerplate->RawFastDoublePropertyAt(index));
     } else {
       Handle<Object> boilerplate_value(boilerplate->RawFastPropertyAt(index),
                                        isolate());
       if (boilerplate_value->IsJSObject()) {
         Handle<JSObject> boilerplate_object =
@@ skipping 175 matching lines @@
   return jsgraph()->simplified();
 }
 
 MachineOperatorBuilder* JSCreateLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8