[PATCH] Fortran: error recovery on arithmetic overflow on unary operations [PR113799]

[Harald Anlauf]

Dear all,

the attached patch improves error recovery when we encounter an
array constructor where a unary operator (e.g. minus) is applied
and -frange-check is active.  The solution is not to terminate
early in that case to avoid inconsistencies between check_result
and reduce_unary when such a situation occurs.

(There might be similar issues for binary operators, not treated
here.)

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

The ICE/memory corruption is actually a 10+ regression.
Do we need a backport?

Thanks,
Harald

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