Completely remove InterruptableThreadState and Fix ThreadRegistry leak

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index c75f1362008c444430ae74f4c5ec4bf06fd66d88..339caadf11579ee061ea6b6c6f80c8041b7dd034 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -169,7 +169,8 @@ void Profiler::BeginExecution(Isolate* isolate) {
   if (profiler_data == NULL) {
     return;
   }
-  ThreadInterrupter::Register(RecordSampleInterruptCallback, isolate);
+  Thread* thread = Thread::Current();
+  thread->SetThreadInterrupter(RecordSampleInterruptCallback, isolate);
   ThreadInterrupter::WakeUp();
 }
 
@@ -182,7 +183,8 @@ void Profiler::EndExecution(Isolate* isolate) {
     return;
   }
   ASSERT(initialized_);
-  ThreadInterrupter::Unregister();
+  Thread* thread = Thread::Current();
+  thread->SetThreadInterrupter(NULL, NULL);
 }