Begin reworking the resource system for LBSE, first rename RenderSVGResource -> LegacyRenderSVGREsource
Pull request: https://github.com/WebKit/WebKit/pull/19494
Committed 269784@main (82d4fe5d16c8): <https://commits.webkit.org/269784@main> Reviewed commits have been landed. Closing PR #19494 and removing active labels.
<rdar://problem/117497248>