[PATCH 3/4] [og8] Attach / Detach C++ FE changes

[Cesar Philippidis]

As noted here <https://gcc.gnu.org/ml/gcc-patches/2018-10/msg01643.html>
this patch adds support for attach and detach in the C++ front end.
Unlike trunk, OG8 has some preliminary support for the this pointer.
Consequently, finish_omp_clauses had to take care of a couple more cases
in order to get libgomp.oacc-c++/this.C to work.

I've committed this patch to openacc-gcc-8-branch.

Cesar
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