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Add a couple of missing `ensure_sufficient_stacks` r? `@saethlin` I hope you didn't spend time on this already. (I couldn't sleep, opened `check_tail_calls`, there was a single call where it could happen, might as well fix it) This PR adds a couple of missing `ensure_sufficient_stack`s: - one in `check_tail_calls` that prevented the #135709 backport on some targets. - after that was fixed, the test still didn't pass starting at 4MB, so I also added one in `check_unsafety` and that made it pass. I didn't add an `rmake` test purposefully limiting the min stack size on `issue-74564-if-expr-stack-overflow.rs`, but we could if we wanted to. On `apple-aarch64-darwin`, this is enough to make `RUST_MIN_STACK=$((1024*1024*3)) ./x test tests/ui --test-args tests/ui/issues/issue-74564-if-expr-stack-overflow.rs` pass for me locally, and it does stack overflow otherwise.