[Patch][AMD GCN][OpenMP] Add gcc/config/gcn/t-omp-device for OpenMP declare variant kind/arch/isa

[Tobias Burnus]

This adds gcc/config/gcn/t-omp-device to augment the nvptx, hsa and x86 
host implementation.

This compiler has -march= carrizo/fiji/gfx900/gfx906 (for Corrizo, Fiji 
and Vega GPUs; arch names aligned with LLVM and passed on to the linker).

This patch uses kind = "gnu" and those -march names for arch *and* isa, 
but can argue about this choice.

(I have build the GCN compiler, but didn't do any additional tests – 
also because GCN as offloading compiler is not yet supported on the trunk.)

OK for the trunk?

Tobias

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