Image copy operations on compressed formats must have dimensions that
are multiples of the block dimensions, unless the extent dimension + its
corresponding offset is equal to the image subresource dimension.

Bug: b/168025369
Change-Id: I3e77bfefe78347d4635128ece10f9d48aef40daa
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/48188Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Sean Risser <srisser@google.com>
Commit-Queue: Alexis Hétu <sugoi@google.com>