Rename rustc_middle::Ty::is_unsafe_ptr to is_raw_ptr

The wording unsafe pointer is less common and not mentioned in a lot of
places, instead this is usually called a "raw pointer". For the sake of
uniformity, we rename this method.
This came up during the review of
https://github.com/rust-lang/rust/pull/134424.

compiler/rustc_ty_utils/src/abi.rs

@@ -753,7 +753,7 @@ fn make_thin_self_ptr<'tcx>(
         // To get the type `*mut RcInner<Self>`, we just keep unwrapping newtypes until we
         // get a built-in pointer type
         let mut wide_pointer_layout = layout;
-        while !wide_pointer_layout.ty.is_unsafe_ptr() && !wide_pointer_layout.ty.is_ref() {
+        while !wide_pointer_layout.ty.is_raw_ptr() && !wide_pointer_layout.ty.is_ref() {
             wide_pointer_layout = wide_pointer_layout
                 .non_1zst_field(cx)
                 .expect("not exactly one non-1-ZST field in a `DispatchFromDyn` type")