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Simplify the monotone analyzer by replacing all the state it used to store in
`BlockState` with a simple vector of lattice elements. Use simple indices to
refer to both blocks and their associated states in the vector. Remove the
ability for transfer functions to control the initial enqueued order of basic
blocks since that was a leaky abstraction. Replace the worklist with a
UniqueDeferredQueue since that has generally proven to be more efficient in
smiilarly contexts, and more importantly, it has a nicer API. Make miscellaneous
simplifications to other code as well.
Delete a few unit tests that exposed the order in which blocks were analyzed
because they printed intermediate results. These tests should be replaced with
tests of analyses' public APIs in the future.
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