Auto merge of #76575 - lcnr:abstract-const, r=oli-obk

compare generic constants using `AbstractConst`s

This is a MVP of rust-lang/compiler-team#340. The changes in this PR should only be relevant if `feature(const_evaluatable_checked)` is enabled.

~~currently based on top of #76559, so blocked on that.~~

r? `@oli-obk` cc `@varkor` `@eddyb`

compiler/rustc_mir/src/transform/mod.rs

@@ -329,7 +329,11 @@ fn mir_promoted(
     // this point, before we steal the mir-const result.
     // Also this means promotion can rely on all const checks having been done.
     let _ = tcx.mir_const_qualif_opt_const_arg(def);
-
+    let _ = if let Some(param_did) = def.const_param_did {
+        tcx.mir_abstract_const_of_const_arg((def.did, param_did))
+    } else {
+        tcx.mir_abstract_const(def.did.to_def_id())
+    };
     let mut body = tcx.mir_const(def).steal();
 
     let mut required_consts = Vec::new();