IOSurface::createCompatibleBitmap allocates 8x size CGBitmapContext
<rdar://problem/126058665>
Pull request: https://github.com/WebKit/WebKit/pull/26966
Committed 277702@main (f0f80b72a8c3): <https://commits.webkit.org/277702@main> Reviewed commits have been landed. Closing PR #26966 and removing active labels.