[Bug tree-optimization/128101] New: [16/17 Regression] seq is not released hot_cold_predict case

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128101

            Bug ID: 128101
           Summary: [16/17 Regression] seq is not released
                    hot_cold_predict case
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

I am not sure this happens at all because phiopt_early_allow will reject
gimple_seq_singleton_p case except for MIN/MAX.

But currently we do:
```
      if (!check_it)
        ;
      else if (contains_hot_cold_predict (middle_bb))
        return false;
      else if (threeway_p
               && middle_bb != middle_bb_alt
               && contains_hot_cold_predict (middle_bb_alt))
        return false;
    }
```

Which does not release the gimple sequence: seq.

It would be better safer to release gimple sequence seq here.