Rollup merge of #129086 - slanterns:is_none_or, r=dtolnay

Stabilize `is_none_or`

Closes: rust-lang/rust#126383.

`@rustbot` label: +T-libs-api

r? libs-api

crates/hir-ty/src/display.rs

@@ -1462,7 +1462,7 @@ fn generic_args_sans_defaults<'ga>(
                     // otherwise, if the arg is equal to the param default, hide it (unless the
                     // default is an error which can happen for the trait Self type)
                     #[allow(unstable_name_collisions)]
-                    default_parameters.get(i).is_none_or(|default_parameter| {
+                    IsNoneOr::is_none_or(default_parameters.get(i), |default_parameter| {
                         // !is_err(default_parameter.skip_binders())
                         //     &&
                         arg != &default_parameter.clone().substitute(Interner, &parameters)