Bug 812380 - optimize less aggressively in TraceWeakMapping. r=billm a=bajaj
Bug 817218 - Move UnmarkGray to the JS engine (r=mccr8)
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Bug 817218 - Followup to fix compile error (r=red)
Bug 690970, part 1: unmark gray read barrier for weak maps. r=billm a=lsblakk
Bug 690970, part 2: unmark gray read barrier for watchpoints. r=billm a=lsblakk
Bug 690970, part 3: fix black-gray edges in weak containers at start of CC. r=billm a=lsblakk
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Bug 829430 - Use the right check for if we're GCing. r=billm