tree b1f83d8261209eba69822d89c767b41ff8ffdb61
parent 5f1946879435fc857120a532cfe47bd133a93902
author Sameer Agarwal <sameeragarwal@google.com> 1661835150 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1662906688 -0700

Unify Block handling across matrix types

Previously some matrices used Block to keep track of
row/column block sizes and some would just use ints, and
then compute the position of each row and column from it.

By uniformly using Block everywhere, we reduce duplicate
computation and data copies.

I also cleaned up a bunch of c++17 related stuff as I edited
these files.

Change-Id: I4c86b1593fd4c91f9057fbb38314f62f303e0477