Stack corruption in derefnull and divbyzero on Windows?
The `derefnull` and `divbyzero` tests appear to fail non-deterministically on Windows (e.g. [this job](https://gitlab.haskell.org/ghc/ghc/-/jobs/402718)), exiting with code 127:
```
cd "rts/divbyzero.run" && ./divbyzero <
Wrong exit code for divbyzero(normal)(expected 8 , actual 127 )
*** unexpected failure for divbyzero(normal)
```
I haven't been able to reproduce this locally, but Phyx has under WinDbg. It may also be more likely to occur under PowerShell then Conemu.
issue