Assembling inherent methods on unnormalized projection self

[compiler-errors]

fn main() {
    let a = [0x04u8];
    a.get_unchecked(0).wrapping_shr(1);
}

error[E0599]: no method named `wrapping_shr` found for reference `&<usize as SliceIndex<[u8]>>::Output` in the current scope
 --> <source>:3:24
  |
3 |     a.get_unchecked(0).wrapping_shr(1);
  |                        ^^^^^^^^^^^^ method not found in `&<usize as SliceIndex<[u8]>>::Output`

error: aborting due to previous error

We try to assemble inherent method candidates on &<usize as SliceIndex<[u8]>>::Output instead of u8. We can solve this by recursing on the normalized type in ProbeContext::assemble_probe => compiler-errors/rust@31cd2a7 is roughly the fix.

[lcnr]

fixed because we structurally resolve in method probing