mgca: Lower all const paths as ConstArgKind::Path

When `#![feature(min_generic_const_args)]` is enabled, we now lower all
const paths in generic arg position to `hir::ConstArgKind::Path`. We
then lower assoc const paths to `ty::ConstKind::Unevaluated` since we
can no longer use the anon const expression lowering machinery. In the
process of implementing this, I factored out `hir_ty_lowering` code that
is now shared between lowering assoc types and assoc consts.

This PR also introduces a `#[type_const]` attribute for trait assoc
consts that are allowed as const args. However, we still need to
implement code to check that assoc const definitions satisfy
`#[type_const]` if present (basically is it a const path or a
monomorphic anon const).

compiler/rustc_builtin_macros/src/format.rs

@@ -190,7 +190,8 @@ fn make_format_args(
                                 && let [stmt] = block.stmts.as_slice()
                                 && let StmtKind::Expr(expr) = &stmt.kind
                                 && let ExprKind::Path(None, path) = &expr.kind
-                                && path.is_potential_trivial_const_arg()
+                                && path.segments.len() == 1
+                                && path.segments[0].args.is_none()
                             {
                                 err.multipart_suggestion(
                                     "quote your inlined format argument to use as string literal",