Extend -Zdump-mir output with two-phase borrow info#105815

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pnkfelix wants to merge 3 commits intorust-lang:masterfrom

pnkfelix:extra-2pb-info

Commits on Dec 14, 2022

include two-phase borrow info in MIR dump output.
pnkfelix
committed

Commits on Dec 17, 2022

address tidy's concerns, and add an aside about output for BorrowKind::Unique while we're at it.
pnkfelix
committed
Update test MIR output to reflect the addition of the `/*2pb*/` marker.
pnkfelix
committed