Fixed bug #95 by changing _M_IX64 to _M_X64 as proposed by Jan Schlicht.
Fixed bug #95 by changing _M_IX64 to _M_X64 as proposed by Jan Schlicht.

mjbshaw/Eigen,rotorliu/eigen,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,madlib/eigen_backup,rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,mjbshaw/Eigen,mjbshaw/Eigen