C++ PATCH for c++/59315 (Wunused-3.C with -fno-use-cxa-atexit)

Jason Merrill jason@redhat.com
Wed Jan 29 04:07:00 GMT 2014

The old build_cleanup called mark_used; the new one that just calls 
cxx_maybe_build_cleanup didn't any more.  So let's add a call in the 
latter function.

Tested x86_64-pc-linux-gnu, applying to trunk.
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