Never regard macro rules with compile_error! invocations as unused

The very point of compile_error! is to never be reached, and one of
the use cases of the macro, currently also listed as examples in the
documentation of compile_error, is to create nicer errors for wrong
macro invocations. Thus, we shuuld never warn about unused macro arms
that contain invocations of compile_error.

compiler/rustc_resolve/src/macros.rs

@@ -870,7 +870,7 @@ impl<'a> Resolver<'a> {
         &mut self,
         item: &ast::Item,
         edition: Edition,
-    ) -> (SyntaxExtension, Vec<Span>) {
+    ) -> (SyntaxExtension, Vec<(usize, Span)>) {
         let (mut result, mut rule_spans) = compile_declarative_macro(
             &self.session,
             self.session.features_untracked(),