Bug 126545 does not depend on any bugs.

Bug 126545 blocks 3 bugs:

•    126545: FTL should not use the inputs of an add or sub as the live-at-exit values in an overflow check, if the values aren't live after [RESOLVED FIXED; assigned to fpizlo]
  •    112840: Use LLVM as a backend for the fourth-tier DFG JIT (a.k.a. the FTL JIT) [RESOLVED FIXED; assigned to fpizlo]
    •    132356: Continue to expand FTL JIT coverage [NEW; assigned to fpizlo]
    •    112836: JSC should be a quadruple-tier VM [RESOLVED FIXED; assigned to fpizlo]