Refactor crate_in_macro_def:

* Don't clone the token stream
* Check the HIR tree before reading attributes

Author: Jarcho

clippy_lints/src/crate_in_macro_def.rs

@@ -53,10 +53,9 @@ declare_lint_pass!(CrateInMacroDef => [CRATE_IN_MACRO_DEF]);
 
 impl EarlyLintPass for CrateInMacroDef {
     fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
-        if item.attrs.iter().any(is_macro_export)
-            && let ItemKind::MacroDef(macro_def) = &item.kind
-            && let tts = macro_def.body.tokens.clone()
-            && let Some(span) = contains_unhygienic_crate_reference(&tts)
+        if let ItemKind::MacroDef(macro_def) = &item.kind
+            && item.attrs.iter().any(is_macro_export)
+            && let Some(span) = contains_unhygienic_crate_reference(&macro_def.body.tokens)
         {
             span_lint_and_sugg(
                 cx,