This patch implements read/write vector data in matrix or matrix data directly
in a shader storage block with row_major qualifier.

Bug: angleproject:1951
Change-Id: Id7847e2245b09414709361412a95c4dd84b9ee97
Reviewed-on: https://chromium-review.googlesource.com/c/1304019Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jiajia Qin <jiajia.qin@intel.com>