Auto merge of #46022 - matthewjasper:cannot-assign-twice-error, r=arielb1

Mir Borrowck: Parity with Ast for E0384 (Cannot assign twice to immutable)

- Closes #45199
- Don't allow assigning to dropped immutable variables
- Show the "first assignment" note on the first assignment that can actually come before the second assignment.
- Make "first assignment" notes point to function parameters if needed.
- Don't show a "first assignment" note if the first and second assignment have the same span (in a loop). This matches ast borrowck for now, but maybe this we should add "in previous loop iteration" as with some other borrowck errors. (Commit 2)
- Use revisions to check mir borrowck for the existing tests for this error. (Commit 3)

~~Still working on a less ad-hoc way to get 'first assignment' notes to show on the correct assignment. Also need to check mutating function arguments.~~ Now using a new dataflow pass.

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