PATCH for debug/9039

[Jason Merrill]

As requested.  dwarf2out was getting confused by an ALIAS_DECL from the
anonymous union.  Debugging backends can't do anything useful with tree
codes they don't know about, so they should just ignore them.

Not regression tested; I think people will agree that this couldn't
possibly break anything that wouldn't have previously aborted.

Applied to trunk only.  Test in g++.dg/debug/anonunion1.C.

2003-03-15  Jason Merrill  <jason@redhat.com>

	PR debug/9039
	* dwarf2out.c (gen_decl_die): Ignore frontend tree codes.

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