stage2 codegen: re-allocate result register in finishAir

In some cases (such as bitcast), an operand may be the same MCValue as
the result. If that operand died and was a register, it was freed by
processDeath. We have to "re-allocate" the register.
5806c386ebjoachimschmidt557 committed on 8/20/2021, 11:06:30 PM· committed by Andrew Kelleyparente48d7bb
2 files changedLine totals unavailable