Reintroduce runtime zone to Isolate.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1744 matching lines @@
       capture_stack_trace_for_uncaught_exceptions_(false),
       stack_trace_for_uncaught_exceptions_frame_limit_(0),
       stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview),
       transcendental_cache_(NULL),
       memory_allocator_(NULL),
       keyed_lookup_cache_(NULL),
       context_slot_cache_(NULL),
       descriptor_lookup_cache_(NULL),
       handle_scope_implementer_(NULL),
       unicode_cache_(NULL),
+      runtime_zone_(this),
       in_use_list_(0),
       free_list_(0),
       preallocated_storage_preallocated_(false),
       inner_pointer_to_code_cache_(NULL),
       write_iterator_(NULL),
       global_handles_(NULL),
       context_switcher_(NULL),
       thread_manager_(NULL),
       fp_stubs_generated_(false),
       has_installed_extensions_(false),
@@ skipping 178 matching lines @@
 void Isolate::SetIsolateThreadLocals(Isolate* isolate,
                                      PerIsolateThreadData* data) {
   Thread::SetThreadLocal(isolate_key_, isolate);
   Thread::SetThreadLocal(per_isolate_thread_data_key_, data);
 }
 
 
 Isolate::~Isolate() {
   TRACE_ISOLATE(destructor);
 
+  // Has to be called while counters_ are still alive
+  runtime_zone_.DeleteKeptSegment();
+
   // The entry stack must be empty when we get here,
   // except for the default isolate, where it can
   // still contain up to one entry stack item
   ASSERT(entry_stack_ == NULL || this == default_isolate_);
   ASSERT(entry_stack_ == NULL || entry_stack_->previous_item == NULL);
 
   delete entry_stack_;
   entry_stack_ = NULL;
 
   delete[] assembler_spare_buffer_;
@@ skipping 524 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal