PATCH: small dwarf2out tweaks

[Jason Merrill]

The first hunk is a minor optimization.  The second is a sanity check
related to debug/6436.

Booted and tested i686-pc-linux-gnu.  Applied trunk only.

2002-05-08  Jason Merrill  <jason@redhat.com>

	* dwarf2out.c (output_call_frame_info): Don't emit a CIE with no FDEs.

	* dwarf2out.c (gen_type_die): Abort on broken recursion.

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