[kernel][novm] fix bug in big block allocs, add some prettier debug
[kernel][novm] fix bug in big block allocs, add some prettier debug

Patch courtesy Erik Corry

minglun-tsai/lk,hollanderic/lkstuff,sndnvaps/lk,sndnvaps/lk,littlekernel/lk,ErikCorryGoogle/lk,minglun-tsai/lk,srodrig1/lk,ErikCorryGoogle/lk,minglun-tsai/lk,srodrig1/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,littlekernel/lk,travisg/lk,littlekernel/lk,sndnvaps/lk,littlekernel/lk,travisg/lk,travisg/lk,ErikCorryGoogle/lk,minglun-tsai/lk,sndnvaps/lk,travisg/lk,hollanderic/lkstuff,srodrig1/lk,srodrig1/lk,sndnvaps/lk,hollanderic/lkstuff,srodrig1/lk