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

src/builtins.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/builtins.h"
 
 #include "src/api.h"
 #include "src/api-arguments.h"
 #include "src/api-natives.h"
 #include "src/base/once.h"
@@ skipping 4561 matching lines @@
   g(&masm, builtin_desc->name, builtin_desc->extra_args);
   // Move the code into the object heap.
   CodeDesc desc;
   masm.GetCode(&desc);
   Code::Flags flags = builtin_desc->flags;
   return isolate->factory()->NewCode(desc, flags, masm.CodeObject());
 }
 
 Handle<Code> CodeStubAssemblerBuilder(Isolate* isolate,
                                       BuiltinDesc const* builtin_desc) {
-  Zone zone;
+  Zone zone(isolate->allocator());
   compiler::CodeStubAssembler assembler(isolate, &zone, builtin_desc->argc,
                                         builtin_desc->flags,
                                         builtin_desc->s_name);
   // Generate the code/adaptor.
   typedef void (*Generator)(compiler::CodeStubAssembler*);
   Generator g = FUNCTION_CAST<Generator>(builtin_desc->generator);
   g(&assembler);
   return assembler.GenerateCode();
 }
 
@@ skipping 174 matching lines @@
 BUILTIN_LIST_T(DEFINE_BUILTIN_ACCESSOR_T)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 #undef DEFINE_BUILTIN_ACCESSOR_T
 #undef DEFINE_BUILTIN_ACCESSOR_H
 
 }  // namespace internal
 }  // namespace v8