Passing large struct as `&mut` and/or returning large structs produces unexpected results

[greenhat]

To reproduce:

1. Checkout Miden edge execution: combat engine + arena account WiktorStarczewski/miden-arena#7
2. Run

cd combat-test-broken && cargo miden build --release
miden vm run target/miden/release/combat_test_broken.masp  # → 80075002 (wrong)