SPARK-4405 [MLLIB] Matrices.* construction methods should check for rows x cols overflow

Check that size of dense matrix array is not beyond Int.MaxValue in Matrices.* methods. jkbradley this should be an easy one. Review and/or merge as you see fit.

Author: Sean Owen <sowen@cloudera.com>

Closes #4461 from srowen/SPARK-4405 and squashes the following commits:

c67574e [Sean Owen] Check that size of dense matrix array is not beyond Int.MaxValue in Matrices.* methods