Remove non-needed clones

I am not certain if this will improve performance,
but it seems having a .clone() without any need should be removed.

This was done with clippy, and manually reviewed:

```
cargo clippy --fix -- -A clippy::all -D clippy::redundant_clone
```

crates/hir/src/source_analyzer.rs

@@ -118,7 +118,7 @@ impl SourceAnalyzer {
     fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprId> {
         let src = match expr {
             ast::Expr::MacroExpr(expr) => {
-                self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?.clone()))?
+                self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?))?
             }
             _ => InFile::new(self.file_id, expr.clone()),
         };