Auto merge of #98638 - bjorn3:less_string_interning, r=tmiasko

Use less string interning

This removes string interning in a couple of places where doing so won't result in perf improvements. I also switched one place to use pre-interned symbols.

compiler/rustc_span/src/symbol.rs

@@ -786,6 +786,7 @@ symbols! {
         impl_lint_pass,
         impl_macros,
         impl_trait_in_bindings,
+        import,
         import_shadowing,
         imported_main,
         in_band_lifetimes,
@@ -1523,6 +1524,7 @@ symbols! {
         use_nested_groups,
         used,
         used_with_arg,
+        using,
         usize,
         v1,
         va_arg,