Given that omp-oacc-kernels-decompose.cc only exists on OG12, the fix
only applies to OG12.

The fail show up since "Kernels loops annotation: C and C++." as that
adds GIMPLE_DEBUG which is not handled in omp-oacc-kernels-decompose.cc
at all. (Actually, it even fails with a sorry when compiling with -g2;
however, -fcompare-debug is supported and was failing.) – For details
see patch.

Tobias
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