Bug 1102541 - Add JS::ubi::RootList::addRoot; r=shu
Bug 1110327 - Fix assertion failure: dbg->isDebuggee(node.compartment()), at vm/Debugger.cpp.
For Debugger.prototype.findObjects, do result accumulation in the
ubi::BreadthFirst traversal callback rather than by iterating over the traversed
set of nodes after the traversal.
r=shu