[JSC] Do not use std::function in setPrivateField and definePrivateField
Created attachment 410202 [details] Patch
Comment on attachment 410202 [details] Patch Seems fine to me.
Committed r267826: <https://trac.webkit.org/changeset/267826> All reviewed patches have been landed. Closing bug and clearing flags on attachment 410202 [details].
<rdar://problem/69830770>