[PATCH] OpenACC routines -- fortran front end

[Cesar Philippidis]

This patch contains for following changes to the Fortran FE:

 * Update module support for acc routines.

 * Add support for the bind and nohost clauses.

 * Add more acc routine diagnostics.

I probably should have split the module changes from the rest of the
routine changes, but they are closely related. Last time I posted the
module patch someone raised the concern that this change would break
backwards compatibility. Considering this patch is for GCC 7, perhaps
the module version number can be bumped to address that problem.

Is this patch ok for trunk?

Cesar

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