try to fix a ICC 11.1 compiler error (bug 217)
try to fix a ICC 11.1 compiler error (bug 217)

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