Mark pair's unit tests using add_pairs as KNOWN_FAILURES on OSX.
Mark pair's unit tests using add_pairs as KNOWN_FAILURES on OSX.

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40410

dachziegel/thrust,zeryx/thrust,thrust/thrust,jaredhoberock/thrust,xiongzhanblake/thrust,egaburov/thrust,thrust/thrust,zeryx/thrust,andrewcorrigan/thrust-multi-permutation-iterator,sdalton1/thrust,zhenglaizhang/thrust,mohamed-ali/thrust,jaredhoberock/thrust,marksantos/thrust,xiongzhanblake/thrust,marksantos/thrust,zhenglaizhang/thrust,thvasilo/thrust,thvasilo/thrust,andrewcorrigan/thrust-multi-permutation-iterator,xiongzhanblake/thrust_src,Ricardo666666/thrust,andrewcorrigan/thrust-multi-permutation-iterator,marksantos/thrust,jaredhoberock/thrust,dachziegel/thrust,GrimDerp/thrust,arnabgho/thrust,jaredhoberock/thrust,xiongzhanblake/thrust,raygit/thrust,mohamed-ali/thrust,arnabgho/thrust,thrust/thrust,dachziegel/thrust,egaburov/thrust,GrimDerp/thrust,thrust/thrust,sarvex/thrust,xiongzhanblake/thrust_src,raygit/thrust,Ricardo666666/thrust,sdalton1/thrust,thrust/thrust,Ricardo666666/thrust,sarvex/thrust,sarvex/thrust,arnabgho/thrust,egaburov/thrust,zeryx/thrust,zhenglaizhang/thrust,mohamed-ali/thrust,jaredhoberock/thrust,sdalton1/thrust,GrimDerp/thrust,xiongzhanblake/thrust_src,raygit/thrust,thvasilo/thrust