[ dwarfdump ] Add symbolic dump of known DWARF attribute values.

[Frédéric Riss]

This patch introduces symbolic dump of all the DWARF standard values (defined in Dwarf.h). It requires the previous DWARFFormValue accessor patch. The fixed accessibility test shows that it’s much easier to check that the test is actually correct, rather than having to cross-check with the enumerator value.

OK?
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