Vulkan:Fix wrong outputCount of emulated RGB copies. The output count of shaderParams equals componentCount divided by Ed. To avoid losing the last data,replace division with UnsignedCeilDivide function. Bug: angleproject:5598 Change-Id: I079d72f4eefa3d6b0f5d80ada25829fea673410c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2666869 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>