[WGSL] validate that alignment is a multiple of RequiredAlignOf(T,C)
rdar://135132177
Pull request: https://github.com/WebKit/WebKit/pull/33557
Committed 283657@main (7fcae8c7c3b8): <https://commits.webkit.org/283657@main> Reviewed commits have been landed. Closing PR #33557 and removing active labels.