CL: Limit max work size/offset to UINT32_MAX Set a hard limit of UINT32_MAX on work item/offset for OpenCL's clEnqueueNDRangeKernel cmd for all backends (simplifies handling). Bug: angleproject:42267067 Change-Id: Ied1685609b3818e4c3a366a03770dc361198639c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6191436 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Austin Annestrand <a.annestrand@samsung.com>