Bug 910826 - IonMonkey: Eliminate the remaining interesting calls to useCount() and defUseCount(), which are linear-time operations. r=h4writer
Bug 910807 - IonMonkey: Add "range" to IONFLAGS=help. r=nbp
Bug 910807 - IonMonkey: Avoid rectifyExponent() calls in unionWith, since it isn't needed, and the invariants it checks are temporarily invalid. r=nbp
Bug 910807 - IonMonkey: Remove Beta's val_ member, which was redundant with getOperand(0), and was suboptimal when the operand is replaced with another beta. r=nbp
Bug 910829 - SpiderMonkey: Delete redundant null checks. r=jandem
Bug 910829 - SpiderMonkey: Put cpp-private classes in anonymous namespaces. r=waldo