Change the timeout handling in the standalone VM to use 64-bit integers

runtime/bin/eventhandler_macos.cc

Index: runtime/bin/eventhandler_macos.cc
diff --git a/runtime/bin/eventhandler_macos.cc b/runtime/bin/eventhandler_macos.cc
index 6823ef878ff14d8b2032cbec4ddee3e742ad5095..63926d82f30373d75961fb21b584d31fceaf140e 100644
--- a/runtime/bin/eventhandler_macos.cc
+++ b/runtime/bin/eventhandler_macos.cc
@@ -350,11 +350,11 @@ void EventHandlerImplementation::HandleEvents(struct kevent* events,
 }
 
 
-intptr_t EventHandlerImplementation::GetTimeout() {
+int64_t EventHandlerImplementation::GetTimeout() {
   if (timeout_ == kInfinityTimeout) {
     return kInfinityTimeout;
   }
-  intptr_t millis = timeout_ - TimerUtils::GetCurrentTimeMilliseconds();
+  int64_t millis = timeout_ - TimerUtils::GetCurrentTimeMilliseconds();
   return (millis < 0) ? 0 : millis;
 }
 
@@ -378,7 +378,9 @@ void EventHandlerImplementation::EventHandlerEntry(uword args) {
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
   while (!handler_impl->shutdown_) {
-    intptr_t millis = handler_impl->GetTimeout();
+    int64_t millis = handler_impl->GetTimeout();
+    ASSERT(millis == kInfinityTimeout || millis >= 0);
+    if (millis > kMaxInt32) millis = kMaxInt32;
     // NULL pointer timespec for infinite timeout.
     ASSERT(kInfinityTimeout < 0);
     struct timespec* timeout = NULL;