Joint work with syoussefi@, who wrote the RewriteRowMajorMatrices
pass, and revised it for this CL to not rely on the
NameNamelessUniformBuffers pass - which was breaking it on the GL
backend.

Hook up previously written RewriteRowMajorMatrices transformation, and
enable on all GPU types on macOS. It is needed at least for AMD and
Intel GPUs.

Add a new test which verifies the behavior of dynamically-indexed
arrays of row-major matrices.

Bug: angleproject:2273
Bug: angleproject:3843
Change-Id: Id582f9cf6b9b1a59091aab1786539174f360b705
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2008717
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>