Rollup merge of #68290 - petrochenkov:passcheck, r=oli-obk

Rollup merge of #68290 - petrochenkov:passcheck, r=oli-obk

Fix some tests failing in `--pass check` mode

Warnings reported at codegen or linking time either have to be converted to errors (preferable), or the tests for them need to be marked with `// ignore-pass` (as a last resort).

https://github.com/rust-lang/rust/commit/ecd5852194f43511443f134aebf0462b58c8e197 turned them from errors to warnings, but that shouldn't be necessary because it's still clear from the `.stderr` output that the errors are lints and not hard-coded.