[committed][OG10] amdgcn: DWARF address spaces

[Andrew Stubbs]

This patch implements DWARF address spaces for pointers to LDS, etc., on 
AMD GCN.

The address space mappings are defined by AMD in their DWARF proposals, 
and the LLVM implementation.

ROCGDB does not actually support this feature yet, I don't believe, but 
will do so soonish.

Committed to devel/omp/gcc-10. Queued for mainline.

Andrew
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