Register VM: don't fail when pre-allocated exit register is the same as a pre-allocated entry register
Register VM: don't fail when pre-allocated exit register is the same as a pre-allocated entry register

WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc