Eliminate some extra list_copy/INSTR_POPs.

git-svn-id: http://svn.boost.org/svn/boost/trunk@83920 b8fc166d-592f-0410-95f2-cb63ce0dd405
Enable /GL.  It seems to help about 10%.

git-svn-id: http://svn.boost.org/svn/boost/trunk@83921 b8fc166d-592f-0410-95f2-cb63ce0dd405
Tweak type.is-derived.

git-svn-id: http://svn.boost.org/svn/boost/trunk@83922 b8fc166d-592f-0410-95f2-cb63ce0dd405