Add pref javascript.options.mem.gc_compacting from http://hg.mozilla.org/mozilla-central/rev/5a4b3f3a0bc3
Add pref javascript.options.mem.gc_compacting from http://hg.mozilla.org/mozilla-central/rev/5a4b3f3a0bc3

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz