drd: Make sure that frame unwind information is generated for DRD intercepts
such that pthread_cancel() works properly. See also Ulrich Drepper, Cancellation
and C++ Exceptions, 2010 (http://udrepper.livejournal.com/21541.html).


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12651 a5019735-40e9-0310-863c-91ae7b9d1cf9
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