Auto merge of #32156 - pnkfelix:borrowck-on-mir-move-analysis, r=nikomatsakis

Move analysis for MIR borrowck

This PR adds code for doing MIR-based gathering of the moves in a `fn` and the dataflow to determine where uninitialized locations flow to, analogous to how the same thing is done in `borrowck`.

It also adds a couple attributes to print out graphviz visualizations of the analyzed MIR that includes the dataflow analysis results.

cc @nikomatsakis