Add a new startup option, --experimental_oom_more_eagerly. Features to have Bazel exit more eagerly due to an OOM will be guarded by this flag.

--
MOS_MIGRATED_REVID=116567102
diff --git a/src/main/cpp/blaze_startup_options.h b/src/main/cpp/blaze_startup_options.h
index 59b893e..d82bfad 100644
--- a/src/main/cpp/blaze_startup_options.h
+++ b/src/main/cpp/blaze_startup_options.h
@@ -146,6 +146,8 @@
 
   int max_idle_secs;
 
+  bool oom_more_eagerly;
+
   // If true, Blaze will listen to OS-level file change notifications.
   bool watchfs;