Removed non-standard conforming (17.4.3.1.2/1) leading underscore.
Removed non-standard conforming (17.4.3.1.2/1) leading underscore.

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