tcg-arm: Handle constant arguments to add2/sub2
We get to re-use the _rIN and _rIK subroutines to handle the various combinations of add vs sub. Fold the << 21 into the opcode enum values so that we can explicitly add TO_CPSR as desired. Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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