Bug 877589 - Add test case. DONTBUILD
Bug 884065 - Assert if JS_DestroyContext is called with active exact rooters; r=sfink

--HG--
extra : rebase_source : 52f7c9f90075b69f3c40bf7c7e9df0e1b2e25c05
Backed out changeset 5a3dc3d31890 (bug 883495)
Bug 884562 - Allow root analysis to be enabled when using generational GC; r=sfink DONTBUILD

--HG--
extra : rebase_source : 6438eec44aa7de79bf78c8f84fb4b971e1e83296
Bug 883789 - Use baseline fallback stubs to track double-overflow of BinaryArith and UnaryArith ops.  r=h4writer