Delete the simulator when we don't need it anymore

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index ef1dd30b227b1ec9a263d27c85ce1ec940715b32..13669cdc75c03defc165507a9613313a22b65dd1 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -389,24 +389,16 @@ class Isolate {
           thread_id_(thread_id),
           stack_limit_(0),
           thread_state_(NULL),
-#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
-    !defined(__aarch64__) && V8_TARGET_ARCH_A64 || \
-    !defined(__mips__) && V8_TARGET_ARCH_MIPS
           simulator_(NULL),
-#endif
           next_(NULL),
           prev_(NULL) { }
+    ~PerIsolateThreadData();
     Isolate* isolate() const { return isolate_; }
     ThreadId thread_id() const { return thread_id_; }
 
     FIELD_ACCESSOR(uintptr_t, stack_limit)
     FIELD_ACCESSOR(ThreadState*, thread_state)
-
-#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
-    !defined(__aarch64__) && V8_TARGET_ARCH_A64 || \
-    !defined(__mips__) && V8_TARGET_ARCH_MIPS
     FIELD_ACCESSOR(Simulator*, simulator)
-#endif
 
     bool Matches(Isolate* isolate, ThreadId thread_id) const {
       return isolate_ == isolate && thread_id_.Equals(thread_id);
@@ -417,12 +409,7 @@ class Isolate {
     ThreadId thread_id_;
     uintptr_t stack_limit_;
     ThreadState* thread_state_;
-
-#if !defined(__arm__) && V8_TARGET_ARCH_ARM || \
-    !defined(__aarch64__) && V8_TARGET_ARCH_A64 || \
-    !defined(__mips__) && V8_TARGET_ARCH_MIPS
     Simulator* simulator_;
-#endif
 
     PerIsolateThreadData* next_;
     PerIsolateThreadData* prev_;