* Remove redundant  statements

* Remove .clone() since A64 implements Copy

* Remove .clone() since InsnId implements Copy

.

* Dereference since *const rb_call_data implements Copy

* Remove unnecessary return statement

* Remove unnecessary braces

* Use .is_empty() over length checks

* Remove unnecessary conversion handling

Since i32 can always fit into i64 (the inner type in Opnd::Imm), the conversion is infallibile.

* Use slice notation in lieu of Vec

https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg

* Simplify match statement