[RFA/DWARF2] Add DW_AT_GNAT_descriptive_type attribute

[Joel Brobecker]

> Ok from the binutils side.

Thank you, Nick. Following Tom's comments, here is what I actually
checked in.

2009-12-29  Joel Brobecker  <brobecker@adacore.com>

        * dwarf2.h (enum dwarf_attribute): Add DW_AT_GNAT_descriptive_type.

-- 
Joel
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