Changes to Lazy task swapping to support abort handler in abort mode (now that we can count to 32).
LazyFixup now ensures all app pages are mapped in before handing on a real (no-lazy) abort. This allows an abort handler in app space itself, without scrambling the details of the original abort (via a lazy abort in abort mode). Many a happy minute spent coding and testing for recursive aborts and fixups, but lets just pretend it doesn't happen shall we. Tested with simple popbang code on ARM9 desktop build. Version 5.35, 220.127.116.11. Tagged as 'Kernel-5_35-4_79_2_36'
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