Don't call exit() with threads running

Otherwise running threads race with destructors.

Bug: 150176543
Test: Build and boot AOSP
Change-Id: I159164a36d9808ae86c2928271b14736178e127b

core/jni/AndroidRuntime.cpp

@@ -1285,12 +1285,11 @@ void AndroidRuntime::exit(int code)
 {
     if (mExitWithoutCleanup) {
         ALOGI("VM exiting with result code %d, cleanup skipped.", code);
-        ::_exit(code);
     } else {
         ALOGI("VM exiting with result code %d.", code);
         onExit(code);
-        ::exit(code);
     }
+    ::_exit(code);
 }
 
 void AndroidRuntime::onVmCreated(JNIEnv* env)