[committed] Improve is-coindexed check for OpenACC/OpenMP (was: [PATCH 10/13] OpenACC 2.6 deep copy: Fortran front-end parts)

[Tobias Burnus]

Julian has committed that patch as Rev. 279628.

Follow up regarding coarrays:

I had proposed to use 'gfc_is_coindexed' instead of only checking the 
rightmost array reference. However, it turned out that this check comes 
too late. (As did the check before Julian's patch.)

Namely, when checking in resolve_omp_clauses the gfc_resolve_expr seems 
to have called – and this changes the expression.  Example: "A[2]" will 
be converted into a function call "_F.caf_get[[A]]" with -fcoarray=lib — 
or to "A" with -fcoarray=single.

Hence, I moved the coindexed check directly after parsing and added a 
test case for it. Coarrays by itself should be fine as they act as 
normal local variables – just that they are allocated by 
_gfortran_caf_register instead of malloc, stack or static allocation.

Committed as Rev. 279637.

Cheers,

Tobias

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