Rollup merge of rust-lang#45588 - Keruspe:master, r=alexcrichton

rustbuild: don't try to install rls if ToolState is not Testing

We already do that for the Dist Step so we would end up trying to install something that we didn't dist.

src/bootstrap/install.rs

@@ -186,8 +186,11 @@ install!((self, builder, _config),
         install_cargo(builder, self.stage, self.target);
     };
     Rls, "rls", _config.extended, only_hosts: true, {
-        builder.ensure(dist::Rls { stage: self.stage, target: self.target });
-        install_rls(builder, self.stage, self.target);
+        if builder.ensure(dist::Rls { stage: self.stage, target: self.target }).is_some() {
+            install_rls(builder, self.stage, self.target);
+        } else {
+            println!("skipping Install RLS stage{} ({})", self.stage, self.target);
+        }
     };
     Analysis, "analysis", _config.extended, only_hosts: false, {
         builder.ensure(dist::Analysis {