[C++ PATCH] Fix 18729 ICE

[Nathan Sidwell]

This fixes 18729, a newly introduced ice-on-invalid.  We create typedefs
with an error_mark_node type, and because we don't have distinct
error_type, error_decl, error_expr nodes, we have to explicitly check
for it.

booted & tested on i686-pc-linux-gnu

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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