NEW167755
GC may not visit event targets for async events 
https://bugs.webkit.org/show_bug.cgi?id=167755
Summary GC may not visit event targets for async events
Michael Saboff
Reported 2017-02-02 14:08:10 PST
] When running the test fast/shadow-dom/slotchange-event-bubbling.html with a Debug build and the options JSC_scribbleFreeCells=true JSC_collectContinuously=true JSC_useGenerationalGC=false the following ASSERT will fire in JSEventListener.h 129 ASSERT(!m_isolatedWorld->isNormal() || m_wrapper || !m_jsFunction); This is due to the Weak m_wrapper having been collected while the m_jsFunction is still alive. We need to make sure we visit wrappers and functions for event targets that are on an asynchromous event queue. <rdar://problem/30316709>
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