[committed] amdgcn: Support basic DWARF

[Andrew Stubbs]

This patch configures the DWARF debug output to match the proposed DWARF 
specification from AMD.  This is already implemented in LLVM and rocgdb 
(out of tree).

This makes no attempt to support CFI, yet, and has some issues with 
vector registers. GCC will need to support some DWARF extensions to make 
those work properly (they're part of the AMD proposal).

Andrew
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