Revised mir-dataflow.

Incorporates many fixes contributed by arielb1.

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revise borrowck::mir::dataflow code to allow varying domain for bitvectors.

This particular code implements the `BitDenotation` trait for three
analyses:

 * `MovingOutStatements`, which, like `borrowck::move_data`, maps each
   bit-index to a move instruction, and a 1 means "the effect of this
   move reaches this point" (and the assigned l-value, if a scoped
   declaration, is still in scope).

 * `MaybeInitializedLvals`, which maps each bit-index to an l-value.
   A 1 means "there exists a control flow path to this point that
   initializes the associated l-value."

 * `MaybeUninitializedLvals`, which maps each bit-index to an l-value
   A 1 means "there exists a control flow path to this point that
   de-initializes the associated l-value."

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Revised `graphviz` dataflow-rendering support in `borrowck::mir`.

One big difference is that this code is now parameterized over the
`BitDenotation`, so that it can be used to render dataflow results
independent of how the dataflow bitvectors are interpreted; see where
reference to `MoveOut` is replaced by the type parameter `D`.

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Factor out routine to query subattributes in `#[rustc_mir(..)]`.

(Later commits build upon this for some unit testing and instrumentation.)

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thread through a tcx so that I can query types of lvalues as part of analysis.

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Revised `BitDenotation::Ctxt`, allowing variation beyond `MoveData`.

The main motivation is to ease threading through a `TyCtxt`.

(In hindsight it might have been better to instead attach the `TyCtxt`
to each of the different dataflow implementations, but that would
require e.g. switching away from having a `Default` impl, so I am
leaving that experiment for another time.)

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