Fixed various simulator-related space leaks.

src/isolate.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 <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 1983 matching lines @@
   eternal_handles_ = NULL;
 
   delete string_stream_debug_object_cache_;
   string_stream_debug_object_cache_ = NULL;
 
   delete random_number_generator_;
   random_number_generator_ = NULL;
 
   delete debug_;
   debug_ = NULL;
+
+#if USE_SIMULATOR
+  Simulator::TearDown(simulator_i_cache_, simulator_redirection_);
+  simulator_i_cache_ = nullptr;
+  simulator_redirection_ = nullptr;
+#endif
 }
 
 
 void Isolate::InitializeThreadLocal() {
   thread_local_top_.isolate_ = this;
   thread_local_top_.Initialize();
 }
 
 
 bool Isolate::PropagatePendingExceptionToExternalTryCatch() {
@@ skipping 765 matching lines @@
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal