Rollup merge of #107769 - compiler-errors:pointer-like, r=eholk

Rename `PointerSized` to `PointerLike`

The old name was unnecessarily vague. This PR renames a nightly language feature that I added, so I don't think it needs any additional approval, though anyone can feel free to speak up if you dislike the rename.

It's still unsatisfying that we don't the user which of {size, alignment} is wrong, but this trait really is just a stepping stone for a more generalized mechanism to create `dyn*`, just meant for nightly testing, so I don't think it really deserves additional diagnostic machinery for now.

Fixes #107696, cc ``@RalfJung``
r? ``@eholk``

compiler/rustc_span/src/symbol.rs

@@ -1084,7 +1084,7 @@ symbols! {
         plugins,
         pointee_trait,
         pointer,
-        pointer_sized,
+        pointer_like,
         poll,
         position,
         post_dash_lto: "post-lto",