Add cache for SVGPathElement "d" attribute parsing to avoid spending CPU time re-parsing the same "d" attribute values.
<rdar://110970184>
Pull request: https://github.com/WebKit/WebKit/pull/19114
Committed 269372@main (75b882901e33): <https://commits.webkit.org/269372@main> Reviewed commits have been landed. Closing PR #19114 and removing active labels.