The slices of 3D and 2D array textures are not at pitch * height offset
apart when the height is odd, due to allocating 2x2 quads for render
targets. Explicitly use the slice size instead.

Change-Id: Id35f35f21a5b2b199215e2526239bcd459141e2c
Reviewed-on: https://swiftshader-review.googlesource.com/14348Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>