More vector_base refactoring: * Implement destructor with destroy() + deallocate() instead of clear().
More vector_base refactoring:
* Implement destructor with destroy() + deallocate() instead of clear().

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40164

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