[Patch, Fortran] PR fortran/46794: Fix ICE with powers of integers

[Tobias Burnus]

Dear Daniel,

Daniel Kraft wrote:
> I do not entirely like the way this is done in the patch (with the two 
> variables and "special casing"), but don't see a better implementation 
> -- what do you think?

I think it is OK - at least I have trouble finding a better solution.

> Regression-tested on x86_64-unknown-linux-gnu without failures -- 
> though the run somehow looked strange to me (on the compile-farm); 
> I'll try again to be sure.  Ok for trunk?

OK for the trunk. Can you check whether one needs to likewise for the 
4.5 and 4.4 branch? (I think one should check on source level - the 
verify_tree might not always catch it. For some reasons, it ICEs here 
with 4.4 and 4.6 but not with 4.5; however, I think that's rather by 
chance and not because of a proper casting.)

Tobias