Fix memory leak in MacOS process handling.

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 b2c2c9b039c6167f7cb6668a5993453958a2e04a..23a65db964506bfb6c0bba21f9042c70afb76dbd 100644
--- a/runtime/bin/eventhandler_macos.cc
+++ b/runtime/bin/eventhandler_macos.cc
@@ -200,10 +200,8 @@ static void PrintEventMask(struct pollfd* pollfd) {
   if ((pollfd->revents & POLLOUT) != 0) printf("POLLOUT ");
   if ((pollfd->revents & POLLERR) != 0) printf("POLLERR ");
   if ((pollfd->revents & POLLHUP) != 0) printf("POLLHUP ");
-  if ((pollfd->revents & POLLRDHUP) != 0) printf("POLLRDHUP ");
   if ((pollfd->revents & POLLNVAL) != 0) printf("POLLNVAL ");
-  int all_events = POLLIN | POLLPRI | POLLOUT |
-                   POLLERR | POLLHUP | POLLRDHUP | POLLNVAL;
+  int all_events = POLLIN | POLLPRI | POLLOUT | POLLERR | POLLHUP | POLLNVAL;
   if ((pollfd->revents & ~all_events) != 0) {
     printf("(and %08x) ", pollfd->revents & ~all_events);
   }