message: memory: allow folding of align condition in mem refinement
diff: @@ -1495,9 +1495,10 @@ void Memory::mkAxioms(const Memory &tgt) const {
  Pointer q(tgt, bid, false);
  auto p_align = p.blockAlignment();
  auto q_align = q.blockAlignment();
  - state->addAxiom(expr::mkIf(p.isHeapAllocated(),
  - p_align == align && q_align == align,
  - p_align.ule(q_align)));
  + state->addAxiom(
  + p.isHeapAllocated().implies(p_align == align && q_align == align));
  + if (!p_align.isConst() || !q_align.isConst())
  + state->addAxiom(p_align.ule(q_align));
  }
  if (!observes_addresses())
  