Array.prototype.concat fast path checks should not be observable
Created attachment 398889 [details] Patch
Created attachment 398890 [details] Patch Tweak ChangeLog.
Comment on attachment 398890 [details] Patch Nice, glad to see that intrinsic is coming in handy. :)
(In reply to Ross Kirsling from comment #3) > Comment on attachment 398890 [details] > Patch > > Nice, glad to see that intrinsic is coming in handy. :) Good job on implementing it and thanks for review! ARMv7 failure is unrelated: https://webkit.org/b/211313.
Committed r261430: <https://trac.webkit.org/changeset/261430> All reviewed patches have been landed. Closing bug and clearing flags on attachment 398890 [details].
<rdar://problem/63044859>