cmse: do not calculate the layout of a type with infer types tracking issue: https://github.com/rust-lang/rust/issues/81391 tracking issue: https://github.com/rust-lang/rust/issues/75835 fixes https://github.com/rust-lang/rust/issues/130104 Don't calculate the layout of a type with an infer type (`_`). This now emits `LayoutError::Unknown`, causing an error similar to when any other calling convention is used in this location. The tests use separate functions because only the first such error in a function body is reported. r? `@davidtwco` (might need some T-types assistance)