VM: Avoid running atexit() handlers during exit() of a failed subprocess spawn

runtime/bin/process_android.cc

Index: runtime/bin/process_android.cc
diff --git a/runtime/bin/process_android.cc b/runtime/bin/process_android.cc
index 11949ba8a2d0b2adf505d0f9e58269f6be1b874d..d2dcca1ed0800d94ab77ec34b2e87e67c34a11a8 100644
--- a/runtime/bin/process_android.cc
+++ b/runtime/bin/process_android.cc
@@ -682,7 +682,10 @@ class ProcessStarter {
                                strlen(os_error_message) + 1);
     }
     VOID_TEMP_FAILURE_RETRY(close(exec_control_[1]));
-    exit(1);
+
+    // We avoid running through registered atexit() handlers because that is
+    // unnecessary work.
+    _exit(1);
   }