Expose a lower bound of malloc'd memory via heap statistics

test/cctest/test-field-type-tracking.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 <stdlib.h>
 #include <utility>
 
 #include "test/cctest/test-api.h"
 
 #include "src/v8.h"
@@ skipping 556 matching lines @@
           expectations.AddDataField(map, NONE, Representation::Smi(), any_type);
       if (i == detach_property_at_index) {
         detach_point_map = map;
       }
     }
   }
   CHECK(!map->is_deprecated());
   CHECK(map->is_stable());
   CHECK(expectations.Check(*map));
 
-  Zone zone;
+  Zone zone(isolate->allocator());
 
   if (is_detached_map) {
     detach_point_map = Map::ReconfigureProperty(
         detach_point_map, detach_property_at_index, kData, NONE,
         Representation::Tagged(), any_type, FORCE_FIELD);
     expectations.SetDataField(detach_property_at_index,
                               Representation::Tagged(), any_type);
     CHECK(map->is_deprecated());
     CHECK(expectations.Check(*detach_point_map,
                              detach_point_map->NumberOfOwnDescriptors()));
@@ skipping 371 matching lines @@
   map2 =
       expectations2.AddDataField(map2, READ_ONLY, to_representation, to_type);
 
   for (int i = kSplitProp + 1; i < kPropCount; i++) {
     map2 = expectations2.AddDataField(map2, NONE, to_representation, to_type);
   }
   CHECK(!map2->is_deprecated());
   CHECK(map2->is_stable());
   CHECK(expectations2.Check(*map2));
 
-  Zone zone;
+  Zone zone(isolate->allocator());
   Handle<Map> field_owner(map->FindFieldOwner(kSplitProp), isolate);
   CompilationInfo info("testing", isolate, &zone);
   CHECK(!info.dependencies()->HasAborted());
   info.dependencies()->AssumeFieldType(field_owner);
 
   // Reconfigure attributes of property |kSplitProp| of |map2| to NONE, which
   // should generalize representations in |map1|.
   Handle<Map> new_map =
       Map::ReconfigureExistingProperty(map2, kSplitProp, kData, NONE);
 
@@ skipping 64 matching lines @@
   map2 =
       expectations2.AddDataField(map2, READ_ONLY, to_representation, to_type);
 
   for (int i = kSplitProp + 1; i < kPropCount; i++) {
     map2 = expectations2.AddDataField(map2, NONE, to_representation, to_type);
   }
   CHECK(!map2->is_deprecated());
   CHECK(map2->is_stable());
   CHECK(expectations2.Check(*map2));
 
-  Zone zone;
+  Zone zone(isolate->allocator());
   Handle<Map> field_owner(map->FindFieldOwner(kSplitProp), isolate);
   CompilationInfo info("testing", isolate, &zone);
   CHECK(!info.dependencies()->HasAborted());
   info.dependencies()->AssumeFieldType(field_owner);
 
   // Reconfigure attributes of property |kSplitProp| of |map2| to NONE, which
   // should generalize representations in |map1|.
   Handle<Map> new_map =
       Map::ReconfigureExistingProperty(map2, kSplitProp, kData, NONE);
 
@@ skipping 1114 matching lines @@
   Handle<AccessorPair> pair = CreateAccessorPair(true, true);
   TransitionToAccessorConstantOperator transition_op(pair);
 
   SameMapChecker checker;
   TestTransitionTo(transition_op, transition_op, checker);
 }
 
 
 // TODO(ishell): add this test once IS_ACCESSOR_FIELD_SUPPORTED is supported.
 // TEST(TransitionAccessorConstantToAnotherAccessorConstant)