[JSC] Micro-optimize YarrJIT's surrogate pair handling
Created attachment 378706 [details] Patch
<rdar://problem/55327915>
Comment on attachment 378706 [details] Patch r=me
Committed r249842: <https://trac.webkit.org/changeset/249842>
Committed r249864: <https://trac.webkit.org/changeset/249864>