RegAllocGreedy: Fix nondeterminism in tryLastChanceRecoloring

tryLastChanceRecoloring iterates over the set of LiveInterval pointers
and used that to seed the recoloring stack, which was
nondeterministic. Fixes a future test failing about 20% of the time.

This just takes the order the interfering vreg was encountered. Not
sure if we should try to order this more intelligently.