message: Link in XLA for open source OSX builds by default
diff: @@ -1426,7 +1426,7 @@ def main():
  if is_ppc64le():
  write_action_env_to_bazelrc('OMP_NUM_THREADS', 1)
  - xla_enabled_by_default = is_linux()
  + xla_enabled_by_default = is_linux() or is_macos()
  set_build_var(environ_cp, 'TF_ENABLE_XLA', 'XLA JIT', 'with_xla_support',
  xla_enabled_by_default, 'xla')
  