Local Hint Resolve perm_store_1 perm_store_2: mem.

(* Specifications: *)
Theorem nextblock_store:
nextblock m2 = nextblock m1.
Theorem store_valid_block_1:
forall b', valid_block m1 b' -> valid_block m2 b'.
Theorem store_valid_block_2:
forall b', valid_block m2 b' -> valid_block m1 b'.