rename allow_internal_unstable() to rustc_allow_const_fn_unstable() in rustc_mir

Followup rename from 05f4a9a,
which introduced `#[rustc_allow_const_fn_unstable]` for `const fn`s.

Author: liketechnik

compiler/rustc_mir/src/transform/check_consts/mod.rs

@@ -77,7 +77,11 @@ pub fn is_lang_panic_fn(tcx: TyCtxt<'tcx>, def_id: DefId) -> bool {
     Some(def_id) == tcx.lang_items().panic_fn() || Some(def_id) == tcx.lang_items().begin_panic_fn()
 }
 
-pub fn allow_internal_unstable(tcx: TyCtxt<'tcx>, def_id: DefId, feature_gate: Symbol) -> bool {
+pub fn rustc_allow_const_fn_unstable(
+    tcx: TyCtxt<'tcx>,
+    def_id: DefId,
+    feature_gate: Symbol,
+) -> bool {
     let attrs = tcx.get_attrs(def_id);
     attr::rustc_allow_const_fn_unstable(&tcx.sess, attrs)
         .map_or(false, |mut features| features.any(|name| name == feature_gate))

compiler/rustc_mir/src/transform/check_consts/validation.rs

@@ -292,7 +292,11 @@ impl Validator<'mir, 'tcx> {
 
             Status::Unstable(gate) if self.tcx.features().enabled(gate) => {
                 let unstable_in_stable = self.ccx.is_const_stable_const_fn()
-                    && !super::allow_internal_unstable(self.tcx, self.def_id().to_def_id(), gate);
+                    && !super::rustc_allow_const_fn_unstable(
+                        self.tcx,
+                        self.def_id().to_def_id(),
+                        gate,
+                    );
                 if unstable_in_stable {
                     emit_unstable_in_stable_error(self.ccx, span, gate);
                 }
@@ -819,7 +823,7 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
 
                     // Otherwise, we are something const-stable calling a const-unstable fn.
 
-                    if super::allow_internal_unstable(tcx, caller, gate) {
+                    if super::rustc_allow_const_fn_unstable(tcx, caller, gate) {
                         return;
                     }