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

src/code-stubs-hydrogen.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 "src/bailout-reason.h"
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/field-index.h"
@@ skipping 279 matching lines @@
   // the runtime that is significantly faster than using the standard
   // stub-failure deopt mechanism.
   if (stub->IsUninitialized() && descriptor.has_miss_handler()) {
     DCHECK(!descriptor.stack_parameter_count().is_valid());
     return stub->GenerateLightweightMissCode(descriptor.miss_handler());
   }
   base::ElapsedTimer timer;
   if (FLAG_profile_hydrogen_code_stub_compilation) {
     timer.Start();
   }
-  Zone zone;
+  Zone zone(isolate->allocator());
   CompilationInfo info(CodeStub::MajorName(stub->MajorKey()), isolate, &zone,
                        stub->GetCodeFlags());
   // Parameter count is number of stack parameters.
   int parameter_count = descriptor.GetStackParameterCount();
   if (descriptor.function_mode() == NOT_JS_FUNCTION_STUB_MODE) {
     parameter_count--;
   }
   info.set_parameter_count(parameter_count);
   CodeStubGraphBuilder<Stub> builder(&info, stub);
   LChunk* chunk = OptimizeGraph(builder.CreateGraph());
@@ skipping 2257 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 }  // namespace internal
 }  // namespace v8