ZJIT: Introduce `GetLEP` HIR instruction (#15917)

This PR is a follow-up to #15816. There, I introduced the `GuardSuperMethodEntry` HIR instruction and that needed the LEP. The LEP was also used by `GetBlockHandler`. Consequently, the codegen for `invokesuper` ended up loading the LEP twice. By introducing a new HIR instruction, we can load the LEP once and use it in both `GetBlockHandler` and `GuardSuperMethodEntry`.

I also updated `IsBlockGiven`, which conditionally loaded the LEP. To ensure we only use `GetLEP` in the cases we need it, I lifted most of the `IsBlockGiven` handler to HIR. As an added benefit, this addressed a TODO that @tekknolagi had written: when `block_given?` is called outside of a method we can rewrite to a constant `false`.

We could use `GetLEP` in the handling of `Defined`, but that looked a bit more involved and I wanted to keep this PR focused, so I'm suggesting we handle that as future work.

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