Rollup merge of #55474 - oli-obk:const_eval_promoted, r=RalfJung

Fix validation false positive

Fixes #55454

r? @RalfJung

src/test/ui/consts/const-validation-fail-55455.rs

@@ -0,0 +1,9 @@
+// https://github.com/rust-lang/rust/issues/55454
+// compile-pass
+
+struct This<T>(T);
+
+const C: This<Option<&i32>> = This(Some(&1));
+
+fn main() {
+}

src/test/ui/consts/promoted-validation-55454.rs

@@ -0,0 +1,9 @@
+// https://github.com/rust-lang/rust/issues/55454
+// compile-pass
+
+#[derive(PartialEq)]
+struct This<T>(T);
+
+fn main() {
+    This(Some(&1)) == This(Some(&1));
+}