Rollup merge of #127557 - linyihai:issue-126694, r=compiler-errors

Add a label to point to the lacking macro name definition

Fixes https://github.com/rust-lang/rust/issues/126694, but adopts the suggestion from https://github.com/rust-lang/rust/issues/118295

```
 --> src/main.rs:1:14
  |
1 | macro_rules! {
  |            ^ put a macro name here
```

compiler/rustc_resolve/src/errors.rs

@@ -669,7 +669,7 @@ pub(crate) struct MacroSuggMovePosition {
 #[note(resolve_missing_macro_rules_name)]
 pub(crate) struct MaybeMissingMacroRulesName {
     #[primary_span]
-    pub(crate) span: Span,
+    pub(crate) spans: MultiSpan,
 }
 
 #[derive(Subdiagnostic)]