target-arm: fix bug in translation of REVSH
The translation of REVSH shifted the low byte 8 steps left before performing an 8-bit sign extend, causing this part of the expression to alwas be 0. Reported-by: NJohan Bengtsson <teofrastius@gmail.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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