test: test segment arena number of instances

[Yoni-Starkware]

This change is 

[dorimedini-starkware]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @noaov1 and @Yoni-Starkware)

---

crates/blockifier/src/execution/entry_point_test.rs line 537 at r1 (raw file):

        entry_point_call.execute_directly(&mut state).unwrap().resources.builtin_instance_counter
            [&BuiltinName::segment_arena],
        2

what does this number represent?

Code quote:

2

---

crates/blockifier/src/execution/entry_point_test.rs line 538 at r1 (raw file):

            [&BuiltinName::segment_arena],
        2
    );

safer... don't want line breaks to remove this for the error preview. non blocking

Suggestion:

    assert_eq!(
        entry_point_call.execute_directly(&mut state).unwrap().resources.builtin_instance_counter
            [&BuiltinName::segment_arena],
        // Note: the number of segment_arena instances should not depend on the compiler or VM
        // version. Do not manually fix this then when upgrading them - it might be a bug.
        2
    );

[dorimedini-starkware]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @noaov1)