nll: remove `NllLivenessMap` from `LivenessContext`

It was used in `compute_for_all_locals` to iterate only the `Local`s that need
liveness analysis (filtered through `compute`). Instead, explicitly extract that
reduced set (as `live_locals`) in `trace` and pass it to
`compute_for_all_locals`.

Change the variable type used in `compute_for_all_locals` from `LiveVar` to
`Local` and do the same for its helper functions (and the functions in
`LocalUseMap` they rely on):

* `add_defs_for`                 -> `LocalUseMap::defs`
* `compute_use_live_points_for`  -> `LocalUseMap::uses`
* `compute_drop_live_points_for` -> `LocalUseMap::drops`

Push back the use of `LiveVar` to the `LocalUseMap` (where the other
`NllLivenessMap` remains embedded) functions which internally do the
`from_local` conversion.

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