We were neglecting to transpose the types here, so were getting
incorrect registers counts for rows and columns.

BUG=angleproject:1072
TEST=dEQP-GLES3.functional.shaders.matrix.*

Change-Id: Ia0ab89bbba8b9e2d8f39e84ef4e8ad3c03bb118d
Reviewed-on: https://chromium-review.googlesource.com/286771Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>