[Patch] Add OpenACC 2.6's no_create

[Thomas Schwinge]

Hi Tobias!

On 2019-11-06T00:47:05+0100, I wrote:
> --- a/libgomp/testsuite/libgomp.oacc-fortran/common-block-2.f90
> +++ b/libgomp/testsuite/libgomp.oacc-fortran/common-block-2.f90
> @@ -76,7 +76,9 @@ program main
>  
>    !$acc enter data create(b)
>  
> -  !$acc parallel loop pcopy(b)
> +  !$acc parallel loop &
> +  !$acc   no_create(b) ! ... here means 'present(b)'.
> +  !TODO But we get: "libgomp: cuStreamSynchronize error: an illegal memory access was encountered".
>    do i = 1, n
>       b(i) = i
>    end do

Either I'm completely confused -- always possible ;-) -- or there's
something wrong; see the two attached test cases, not actually related to
Fortran common blocks at all.  If such a basic usage of the 'no_create'
clause doesn't work...?  So, again..., seems that my suspicion was right
that this patch doesn't have sufficient test coverage at all.  Or, I'm
completely confused -- we still have that option, too.  ;-\


Grüße
 Thomas


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