1. Add a fast matrix update function to do a single memcpy for uniform
matrix assignment with same layout. It benefits row-4 no-transpose GLSL
matrix and col-4 transpose HLSL matrix.
2. Make boolean IsColumnMajor to be a template parameter in generate
uniform matrix updating, which gets rid of the conditional branch
in loop and has better performance.
3. Add e2e test of uploading multiple 3x4 GLSL matrices at the same
time, which adds coverage to this CL.

Bug: angleproject:3632
Change-Id: Id1701ef6fbf63ea4b9884254d93ea8eacfe4e16a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1688274
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>