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

src/code-stubs.cc

 // Copyright 2012 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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/code-factory.h"
@@ skipping 437 matching lines @@
       break;
     case CompareICState::GENERIC:
       GenerateGeneric(masm);
       break;
   }
 }
 
 
 Handle<Code> TurboFanCodeStub::GenerateCode() {
   const char* name = CodeStub::MajorName(MajorKey());
-  Zone zone;
+  Zone zone(isolate()->allocator());
   CallInterfaceDescriptor descriptor(GetCallInterfaceDescriptor());
   compiler::CodeStubAssembler assembler(isolate(), &zone, descriptor,
                                         GetCodeFlags(), name);
   GenerateAssembly(&assembler);
   return assembler.GenerateCode();
 }
 
 void AllocateHeapNumberStub::GenerateAssembly(
     compiler::CodeStubAssembler* assembler) const {
   typedef compiler::Node Node;
@@ skipping 2983 matching lines @@
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8