Chrono: merge fixes for #9274, #9276.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86448 b8fc166d-592f-0410-95f2-cb63ce0dd405
Thread: merge update history for limitations.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86449 b8fc166d-592f-0410-95f2-cb63ce0dd405
TypeTraits/common_type fix typo. fix #8785.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86458 b8fc166d-592f-0410-95f2-cb63ce0dd405