Similar to #32031 a struct P<D> { value: f32, PhantomData<D>, } is mapped to i32 instead of f32 in the resulting llvm-ir output. Based on IRC discussions with @rkruppe the issue is likely caused by the inclusion of any zero-sized types in the struct.

A minimal example is available at https://github.com/iliekturtles/llvm-opt/tree/fa05ddb4fb869e492e04c93e04fa0e939fb2fb49 and includes the offending llvm-ir and asm output.