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[WIP][release/2.2] Arm stepping fix #19653
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Issue #19255 requested the port of the following PR's from master to 2.1:
#17617
#17879
#17990
#18129
#18247
Porting these fixes from master to 2.2 as well. This addresses gaps in out ARM debugging support and prevent further regressions that would be introduced if #19652 gets merged. In particular, the castings from PISNTR to PCODE were not preserving the thumb bit, causing stepping in ARM debugging to break.