[herd,asl] Implement basic ASL+VMSA #916
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Notice that page table are accessed in PTE2 mode. That is, PTE accesses undergo the vrtual to physical translation, as the mode that is naturally compatible with existing ASL code.
The most rewarding gains result from (hand-made) deforestion in ASLSem.ml, due to dramatic reduction of memory footprint.
This additions permits early pruning of pruned executions, resultng in more runtime gains.
Notice that spurious AF updates are not implemented.
Such a transmission is instrumental to the correct understanding of per proc HA and HD settings.
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Basic ASL+VMSA, tested on simple loads and stores. The current implementation handle successful accesses and three errors: invalid page table entries, writing on a non-writable page, hardware management of access flag and dirty bit.