[turbofan] Track multiple maps for LoadElimination.

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 188 matching lines @@
         Handle<Map> property_cell_value_map(
             Handle<HeapObject>::cast(property_cell_value)->map(), isolate());
         if (!property_cell_value_map->is_stable()) return NoChange();
         dependencies()->AssumeMapStable(property_cell_value_map);
 
         // Check that the {value} is a HeapObject.
         value = effect = graph()->NewNode(simplified()->CheckHeapObject(),
                                           value, effect, control);
 
         // Check {value} map agains the {property_cell} map.
-        effect = graph()->NewNode(
-            simplified()->CheckMaps(1), value,
-            jsgraph()->HeapConstant(property_cell_value_map), effect, control);
+        effect = graph()->NewNode(simplified()->CheckMaps(ZoneHandleSet<Map>(
+                                      property_cell_value_map)),
+                                  value, effect, control);
         property_cell_value_type = Type::OtherInternal();
         representation = MachineRepresentation::kTaggedPointer;
       } else {
         // Check that the {value} is a Smi.
         value = effect =
             graph()->NewNode(simplified()->CheckSmi(), value, effect, control);
         property_cell_value_type = Type::SignedSmall();
         representation = MachineRepresentation::kTaggedSigned;
       }
       effect = graph()->NewNode(
@@ skipping 51 matching lines @@
   return jsgraph()->javascript();
 }
 
 SimplifiedOperatorBuilder* JSGlobalObjectSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8