Do not call priv_from_js from the GObject tracer
Do not call priv_from_js from the GObject tracer

priv_from_js calls JS_BeginRequest when it refers to a dynamic JSClass
(such as that used by GObjects), and that causes a deadlock when
called from the GC thread

https://bugzilla.gnome.org/show_bug.cgi?id=678908

endlessm/gjs,mtwebster/cjs,endlessm/gjs,mtwebster/cjs,pixunil/cjs,mtwebster/cjs,djdeath/gjs,pixunil/cjs,pixunil/cjs,djdeath/gjs,mtwebster/cjs,djdeath/gjs,djdeath/gjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,djdeath/gjs,pixunil/cjs,endlessm/gjs,mtwebster/cjs