Fix almost all leaks of InterruptableThreadState instances.

runtime/vm/thread.h

Index: runtime/vm/thread.h
diff --git a/runtime/vm/thread.h b/runtime/vm/thread.h
index 44b804013e7b6ec3c85ff4c0d8ef290d7ac88ca5..62e540a2d6993e0c7fe016a7656b64d791b68726 100644
--- a/runtime/vm/thread.h
+++ b/runtime/vm/thread.h
@@ -124,11 +124,11 @@ class Thread {
 
   void set_thread_state(InterruptableThreadState* state) {
     ASSERT((thread_state() == NULL) || (state == NULL));
-    state_.thread_state = state;
+    thread_state_ = state;
   }
 
   InterruptableThreadState* thread_state() const {
-    return state_.thread_state;
+    return thread_state_;
   }
 
   static intptr_t heap_offset() {
@@ -200,8 +200,6 @@ class Thread {
     uword top_exit_frame_info;
     StackResource* top_resource;
     TimelineEventBlock* timeline_block;
-    // TODO(koda): Migrate individual fields of InterruptableThreadState.
-    InterruptableThreadState* thread_state;
     LongJumpScope* long_jump_base;
 #if defined(DEBUG)
     HandleScope* top_handle_scope;
@@ -240,6 +238,8 @@ CACHED_CONSTANTS_LIST(DEFINE_OFFSET_METHOD)
   Heap* heap_;
   State state_;
   StoreBufferBlock* store_buffer_block_;
+  // TODO(koda): Migrate individual fields of InterruptableThreadState.
+  InterruptableThreadState* thread_state_;
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
   type_name member_name;
 CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)