fix: read ICSR volatile in SCB::vect_active()#664
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`SCB::vect_active()` now reads ICSR with a volatile access, preventing the load from being narrowed to a byte read that faults on word-only ICSR models.
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SCB::vect_active()now reads ICSR with a volatile access, preventing the load from being narrowed to a byte read that faults on word-only ICSR models.