Rollup merge of #155961 - jdonszelmann:deny-warnings-stable, r=mejrs Deny warnings in the test for crates that are available on stable We've got a couple of crates, like `rustc_type_ir` that have parts disabled on stable. I believe part of this is so, for example, rust-analyzer can use bits of the compiler. We previously allowed warnings here, and I ran into one. This denies warnings in the test that compiles these stable crates (I chose not to on the crate itself, so you don't *constantly* run into the warnings if you have turned that off in `config.toml`). This test doesn't run by default, but it does run in CI.
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