Auto merge of #130337 - BoxyUwU:anon_const_macro_call, r=camelid

Fix anon const def-creation when macros are involved take 2

Fixes #130321

There were two cases that #129137 did not handle correctly:

- Given a const argument `Foo<{ bar!() }>` in which `bar!()` expands to `N`, we would visit the anon const and then visit the `{ bar() }` expression instead of visiting the macro call. This meant that we would build a def for the anon const as `{ bar!() }` is not a trivial const argument as `bar!()` is not a path.
- Given a const argument `Foo<{ bar!() }>` is which `bar!()` expands to `{ qux!() }` in which `qux!()` expands to `N`, it should not be considered a trivial const argument as `{{ N }}` has two pairs of braces.  If we only looked at `qux`'s expansion it would *look* like a trivial const argument even though it is not. We have to track whether we have "unwrapped" a brace already when recursing into the expansions of `bar`/`qux`/any macro

r? `@camelid`

compiler/rustc_resolve/src/late.rs

@@ -4546,7 +4546,7 @@ impl<'a, 'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
         );
 
         self.resolve_anon_const_manual(
-            constant.value.is_potential_trivial_const_arg(),
+            constant.value.is_potential_trivial_const_arg(true),
             anon_const_kind,
             |this| this.resolve_expr(&constant.value, None),
         )
@@ -4710,7 +4710,7 @@ impl<'a, 'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'a, 'ast, 'ra, 'tcx> {
                     // that is how they will be later lowered to HIR.
                     if const_args.contains(&idx) {
                         self.resolve_anon_const_manual(
-                            argument.is_potential_trivial_const_arg(),
+                            argument.is_potential_trivial_const_arg(true),
                             AnonConstKind::ConstArg(IsRepeatExpr::No),
                             |this| this.resolve_expr(argument, None),
                         );