I had this patch lying around since about half a year. I did tweak and agumented it
a bit today, but finally want to get rid of it (locally - by getting it committed) ...

This patch changes -misa to -march for nvptx (the latter is now an alias
for the former), it adds a new section about libmemkind and some information
about interns of our nvptx/gcn implementation. (The latter should be mostly
correct, but I might have missed some fine print or a more recent update.)

OK for mainline?

Tobias


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