Local Hint Resolve valid_access_alloc_other valid_access_alloc_same: mem.

Theorem valid_access_alloc_inv:
forall chunk b' ofs p,
valid_access m2 chunk b' ofs p ->
if eq_block b' b
then lo <= ofs /\ ofs + size_chunk chunk <= hi /\ (align_chunk chunk | ofs)
else valid_access m1 chunk b' ofs p.