// If the virtual register was never materialized into a register, it
// might not be in the map, but it won't hurt to zero it out anyway.
unsigned &PhysRegSlot = getVirt2PhysRegMapSlot(VirtReg);
// If the virtual register was never materialized into a register, it
// might not be in the map, but it won't hurt to zero it out anyway.
unsigned &PhysRegSlot = getVirt2PhysRegMapSlot(VirtReg);