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..1f597a1e80da552ceae01073ca2499c69897b08b 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;
@@ -41,8 +40,13 @@ class ThreadInterrupterLinux : public AllStatic {
 
 
 void ThreadInterrupter::InterruptThreads(int64_t current_time) {
-  for (intptr_t i = 0; i < threads_size_; i++) {
-    ThreadState* state = threads_[i];
+  for (intptr_t i = 0; i < Isolate::isolates_size_; i++) {
+    Isolate* isolate = Isolate::isolates_[i];
+    ASSERT(isolate != NULL);
+    InterruptableThreadState* state = isolate->thread_state();
+    if (state == NULL) {
+      continue;
+    }
     ASSERT(state->id != Thread::kInvalidThreadId);
     if (FLAG_trace_thread_interrupter) {
       OS::Print("ThreadInterrupter interrupting %p\n",