mir: validate Move call arguments are locals or box derefs

[rabindra789]

Fixes #103362.

When a Call or TailCall argument is Operand::Move(place), the callee receives the place by reference. Such moves are only valid for plain locals or the contents of a box (a single Deref of a box-typed local).

Add a verifier check under -Zvalidate-mir, using the same phase gate as the existing Operand::Copy validation. This avoids affecting the unconditional validation after the final optimization phase.

The regression test uses custom MIR to verify that invalid move arguments are rejected. Rustc-generated MIR is unaffected because move arguments are materialized into temporaries before calls.

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[rustbot]

r? @mati865

rustbot has assigned @mati865.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: compiler
• compiler expanded to 75 candidates
• Random selection from 18 candidates