JDK-8297933 added new fields to `TypePtr`:

```
    int _hash_computed:1;
    int _exact_klass_computed:1;
    int _is_loaded_computed:1;
```

SonarCloud reports a warning for them:
  Single-bit named bit fields should not be of a signed type cpp:S2216

With 1 bit field, there is only a place for sign, not the value. Storing "1" into that field might effectively converts it to "-1" on the compilers I have tried. These fields are currently used as "booleans" by boolean-converting non-zeros to true, so there is no bug yet for those compilers. But, I can see how a compiler can convert "1" to "0", only effectively storing the sign bit, introducing subtle bugs.