Give R8 more memory on the bots and golem until we have memory under control

Change-Id: Ifbd853767f9f9eae52727de00102c911a5bfbfd8
diff --git a/tools/run_on_app.py b/tools/run_on_app.py
index ad38cab..76fc59b 100755
--- a/tools/run_on_app.py
+++ b/tools/run_on_app.py
@@ -172,6 +172,8 @@
 def run_with_options(options, args):
   app_provided_pg_conf = False;
   extra_args = []
+  # todo(121018500): remove when memory is under control
+  extra_args.append('-Xmx8GB')
   if options.golem:
     golem.link_third_party()
     options.out = os.getcwd()