Rollup merge of #123464 - fmease:rn-has-proj-to-has-aliases, r=compiler-errors

Cleanup: Rename `HAS_PROJECTIONS` to `HAS_ALIASES` etc.

The name of the bitflag `HAS_PROJECTIONS` and of its corresponding method `has_projections` is quite historical dating back to a time when projections were the only kind of alias type.

I think it's time to update it to clear up any potential confusion for newcomers and to reduce unnecessary friction during contributor onboarding.

r? types

compiler/rustc_trait_selection/src/traits/project.rs

@@ -431,7 +431,7 @@ pub(super) fn opt_normalize_projection_type<'a, 'b, 'tcx>(
 
             let projected_term = selcx.infcx.resolve_vars_if_possible(projected_term);
 
-            let mut result = if projected_term.has_projections() {
+            let mut result = if projected_term.has_aliases() {
                 let normalized_ty = normalize_with_depth_to(
                     selcx,
                     param_env,
@@ -595,7 +595,7 @@ pub fn normalize_inherent_projection<'a, 'b, 'tcx>(
     let ty = tcx.type_of(alias_ty.def_id).instantiate(tcx, args);
 
     let mut ty = selcx.infcx.resolve_vars_if_possible(ty);
-    if ty.has_projections() {
+    if ty.has_aliases() {
         ty = normalize_with_depth_to(selcx, param_env, cause.clone(), depth + 1, ty, obligations);
     }