Adopt PLATFORM(VISION) wherever PLATFORM(IOS) is used (Tools version)
<rdar://problem/110427723>
Pull request: https://github.com/WebKit/WebKit/pull/14766
Committed 264963@main (70f1cbcc20e8): <https://commits.webkit.org/264963@main> Reviewed commits have been landed. Closing PR #14766 and removing active labels.