This is a regression introduced in r246075.
<rdar://problem/52669111>
Created attachment 373545 [details] proposed patch.
Thanks for the review. Landed in r247183: <http://trac.webkit.org/r247183>.
Comment on attachment 373545 [details] proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=373545&action=review > Source/JavaScriptCore/dfg/DFGArgumentsEliminationPhase.cpp:610 > + // yet to be processed. Inside the look, it refers to the index Look => loop