Use list of isolates in profiler

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 ee6b4a7569ea7f6f57d416a2f8194b069ed590fa..f898fcc3abaf5aa58efa5d96f4e6cb5cff0b2fcb 100644
--- a/runtime/vm/thread_interrupter_linux.cc
+++ b/runtime/vm/thread_interrupter_linux.cc
@@ -20,8 +20,7 @@ class ThreadInterrupterLinux : public AllStatic {
     if (signal != SIGPROF) {
       return;
     }
-    ThreadInterrupter::ThreadState* state =
-        ThreadInterrupter::CurrentThreadState();
+    InterruptableThreadState* state = ThreadInterrupter::CurrentThreadState();
     if ((state == NULL) || (state->callback == NULL)) {
       // No interrupter state or callback.
       return;
@@ -40,16 +39,12 @@ class ThreadInterrupterLinux : public AllStatic {
 };
 
 
-void ThreadInterrupter::InterruptThreads(int64_t current_time) {
-  for (intptr_t i = 0; i < threads_size_; i++) {
-    ThreadState* state = threads_[i];
-    ASSERT(state->id != Thread::kInvalidThreadId);
-    if (FLAG_trace_thread_interrupter) {
-      OS::Print("ThreadInterrupter interrupting %p\n",
-                reinterpret_cast<void*>(state->id));
-    }
-    pthread_kill(state->id, SIGPROF);
+void ThreadInterrupter::InterruptThread(InterruptableThreadState* state) {
+  if (FLAG_trace_thread_interrupter) {
+    OS::Print("ThreadInterrupter interrupting %p\n",
+              reinterpret_cast<void*>(state->id));
   }
+  pthread_kill(state->id, SIGPROF);
 }