Opaque Mem.storebytes.

Lemma mem_obs_eq_storeF:
forall f mc mf mf' chunk b ofs v pmap pmap2
(Hlt: permMapLt pmap (getMaxPerm mf))
(Hlt': permMapLt pmap (getMaxPerm mf'))
(Hlt2: permMapLt pmap2 (getMaxPerm mf))
(Hstore: Mem.store chunk (restrPermMap Hlt2) b ofs v = Some mf')
(Hdisjoint: permMapCoherence pmap pmap2 \/ permMapsDisjoint pmap pmap2)
(Hobs_eq: mem_obs_eq f mc (restrPermMap Hlt)),
mem_obs_eq f mc (restrPermMap Hlt').