2c3ca0931d
Tweak the way we protect in-place function arguments in interpreters
Use `MPlaceTy` instead of `PlaceTy` in `FnArg` and ignore (copy) locals in an earlier step ("Locals that don't have their address taken are as protected as they can ever be").
This seems to be crucial for tail call support (as they can't refer to caller's locals which are killed when replacing the stack frame).
r? `@RalfJung`
cc `@oli-obk`
see https://github.com/rust-lang/rust/pull/121273#issuecomment-1980210690
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