Prior to this change, row-major and column-major matrices generated
different types.  That is not correct.  With this change, the same type
is generated for both.  Row-major only comes into account when
calculating the alignment and offset of fields in a block.

Bug: angleproject:4889
Change-Id: Ifa03e1799a2510b90323d9d4fc2f681a3184069b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2953367
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>