[C++] Fix 18981

[Nathan Sidwell]

This patch fixes 18981, and ICE caused by some unnecessary flag setting.
Those flags are already set by make_typename_type itself.

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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