Completely remove InterruptableThreadState and Fix ThreadRegistry leak

runtime/vm/thread_interrupter_linux.cc

Index: runtime/vm/thread_interrupter_linux.cc
diff --git a/runtime/vm/thread_interrupter_linux.cc b/runtime/vm/thread_interrupter_linux.cc
index 5b275c237bbd41509ecca03c72f9fd82f352ad0a..d7b9b8532abf2e3fd05d76603f5ff89e81dedf69 100644
--- a/runtime/vm/thread_interrupter_linux.cc
+++ b/runtime/vm/thread_interrupter_linux.cc
@@ -22,33 +22,36 @@ class ThreadInterrupterLinux : public AllStatic {
     if (signal != SIGPROF) {
       return;
     }
-    InterruptableThreadState* state = ThreadInterrupter::CurrentThreadState();
-    if ((state == NULL) || (state->callback == NULL)) {
-      // No interrupter state or callback.
+    Thread* thread = Thread::Current();
+    if (thread == NULL) {
+      return;
+    }
+    ThreadInterruptCallback callback = NULL;
+    void* callback_data = NULL;
+    if (!thread->IsThreadInterrupterEnabled(&callback, &callback_data)) {
       return;
     }
-    ASSERT(OSThread::Compare(state->id, OSThread::GetCurrentThreadId()));
     // Extract thread state.
     ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
     mcontext_t mcontext = context->uc_mcontext;
     InterruptedThreadState its;
-    its.tid = state->id;
+    its.tid = thread->id();
     its.pc = SignalHandler::GetProgramCounter(mcontext);
     its.fp = SignalHandler::GetFramePointer(mcontext);
     its.csp = SignalHandler::GetCStackPointer(mcontext);
     its.dsp = SignalHandler::GetDartStackPointer(mcontext);
     its.lr = SignalHandler::GetLinkRegister(mcontext);
-    state->callback(its, state->data);
+    callback(its, callback_data);
   }
 };
 
 
-void ThreadInterrupter::InterruptThread(InterruptableThreadState* state) {
+void ThreadInterrupter::InterruptThread(Thread* thread) {
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter interrupting %p\n",
-              reinterpret_cast<void*>(state->id));
+              reinterpret_cast<void*>(thread->id()));
   }
-  int result = pthread_kill(state->id, SIGPROF);
+  int result = pthread_kill(thread->id(), SIGPROF);
   ASSERT(result == 0);
 }