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

[Daniel Kraft]

Tobias Burnus wrote:
> 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.)

Committed the attached (patch adapted to 4.4 including fix of test-case) 
as rev. 167644 to 4.4 branch.  When 4.5 is open again, I will fix the 
test-case there, too, and then close the PR.

Yours,
Daniel

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