[Patch] OpenMP/Fortran: Permit assumed-size arrays in uniform clause

[Tobias Burnus]

Testcase wise, the run-time testcase libgomp.fortran/examples-4/simd-2.f90
checks essentially the same, except that it uses an array-descriptor array
(assumed shape) while this testcase uses an assumed-size array.

I decided for an extra compile-time only testcase, but it could be also be
moved to libgomp as run-time test or the other test could be extended to
also test assumed-size arrays.

The OpenMP examples document contains two testcases which now pass,
but are reject without this patch:
- SIMD/sources/SIMD.2.f90 (for OpenMP 4.0)
- SIMD/sources/linear_modifier.3.f90 (for OpenMP 5.2)

OK for mainline?

Tobias
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