Bug#705838: clang pure virtual function call crash with binaries built with C++11's std::thread - request for backport

[Shaun Reich]

Package: clang
Version: 3.2-1

clang 3.2 was shipped with a bug that was fixed only ~2 weeks ago,
that affected all binaries which utilized C++11's std::thread
mechanism, and were built with clang.  and apparently llvm doesn't do
bugfix releases :(

The llvm bug report link below already has a test case and at the
bottom which revision it was fixed in ( r178816 ).

Fix doesn't seem invasive, so I'd like to get this in here so I can
actually build my app, (on an ubuntu workstation).

http://llvm.org/bugs/show_bug.cgi?id=12730