Using linear (added by the compiler) + explicit lastprivate gives an error.

To quote Jakub from the PR:
"If it is the FE that adds the linear clause, then it
shouldn't when there is explicit lastprivate clause.
This is a new thing in OpenMP 5.0, in 4.5 it was invalid to
make the iterate anything but linear in this case, now
it can be made private or lastprivate."

Actually, the check which permitted this was committed
early during GCC 11 development, but the some updates of
trans-openmp.c were missing.

OK?

Tobias

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