[PATCH, OpenACC] (2/2) Fix implicit mapping for array slices on lexically-enclosing data constructs (PR70828)

[Julian Brown]

This follow-up patch enables the "inheritance" of mappings for OpenACC
data constructs to work also for Fortran assumed-size arrays.
Otherwise, such arrays are (arguably, prematurely) bailed out on in the
Fortran front-end.

Tested alongside the previous patch with offloading to nvptx.

OK to apply?

Thanks,

Julian

2018-08-28  Julian Brown  <julian@codesourcery.com>

	gcc/fortran/
	* trans-openmp.c (gfc_omp_finish_clause): Don't raise error for
	assumed-size array if present in a lexically-enclosing data construct.

	libgomp/
	* testsuite/libgomp.oacc-fortran/pr70828-4.f90: New test.
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