message: Temporarily revert to old switch map removal logic
  Summary: Switch off the new `OptimizeEnumsUnmap` logic to investigate the nondeterminism issue.
diff: @@ -677,7 +677,7 @@ class OptimizeEnums {
  // TODO(ngorski): This is left in just to minimize diff size
  // for review, and is deleted later in the diff stack.
  - const bool kUseMatchFlow = true;
  + const bool kUseMatchFlow = false;
  if (kUseMatchFlow) {
  unmap.unmap_switchmaps(cfg);
  } else {
  