Make it easier to debug aborts that were triggered by ABT/UND code
Detail: s/Middle - Tweak register dump generation so that it'll attempt to provide sensible R13 & R14 values if the abort came from the same mode that we're handling the abort in. R13 will be adjusted by however much data we've pushed onto the stack, and R14 will be set to &DEADDEAD to indicate that the CPU has corrupted it and we don't know what the original value was. Admin: Tested on BB-xM Version 5.98. Tagged as 'Kernel-5_98'
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