We make a ton of calls to IonInIC::update and OperatorIn on the Elm benchmark. I didn't investigate why, but I'm pretty sure we need a megamorphic stub for this (we have one for JSOP_HASOWN but not JSOP_IN).
(Still hard to believe we didn't even have an Ion IC for this until bug 1337773, Firefox 55 :)
Assignee: nobody → tcampbell
Status: NEW → ASSIGNED
Looks like it was actually missing proxy support. Patches on Bug 1357759 seem to fix all remaining failed ICs in firefox startup + speedometer except for things with Resolve hooks (XPCComponents_Interfaces, XPCWrappedNative_NoHelper, and ArgumentsObjects).
Status: ASSIGNED → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1357759
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