kRegisterUnused
case CFI_Parser<A, R>::kRegisterUnused:
if (prolog.savedRegisters[i].location == CFI_Parser<A, R>::kRegisterUnused)
case CFI_Parser<A, R>::kRegisterUnused:
results->savedRegisters[reg].location = kRegisterUnused;
results->savedRegisters[reg].location = kRegisterUnused;