JIT: Cache memory dependencies for VN map selects (#89241)

JIT: Cache memory dependencies for VN map selects (#89241)

Hoisting relies on being able to look at which memory dependencies a
candidate is dependent upon. VN tracks these during the map select
logic; however, it fails to do so when the map selection hits the cache.
This changes the logic to make sure the memory dependencies are cached.

Fix #75442