Merge Visual C++ 12 fix for Unordered.


git-svn-id: http://svn.boost.org/svn/boost/branches/release@86551 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread: merge [86540] to fix #9319.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86552 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merged the latest tweaks to dynamic_bitset/example/timing_tests.cpp (trunk revision 86553).

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86556 b8fc166d-592f-0410-95f2-cb63ce0dd405