heap: merge changes from trunk



git-svn-id: http://svn.boost.org/svn/boost/branches/release@85191 b8fc166d-592f-0410-95f2-cb63ce0dd405
lockfree: merge changes from trunk



git-svn-id: http://svn.boost.org/svn/boost/branches/release@85192 b8fc166d-592f-0410-95f2-cb63ce0dd405