Arm: Fix lack of zero-extension for 8/16 bit add/sub with immediate. (#23749 - 9.4 Backport)
This makes sure we properly set the high bits even for 8-16bit add/sub.
See #23749 (closed) for the details
This makes sure we properly set the high bits even for 8-16bit add/sub.
See #23749 (closed) for the details