Auto merge of #82552 - GuillaumeGomez:rollup-8dn1ztn, r=GuillaumeGomez

Rollup of 8 pull requests

Successful merges:

 - #81940 (Stabilize str_split_once)
 - #82165 (Reword labels on E0308 involving async fn return type)
 - #82456 (Replaced some unwrap_or and map_or with lazy variants)
 - #82491 (Consider inexpensive inlining criteria first)
 - #82506 (Properly account for non-shorthand pattern field in unused variable lint)
 - #82535 (Set codegen thread names)
 - #82545 (rustdoc: add optional woff2 versions of FiraSans.)
 - #82549 (Revert "Update normalize.css to 8.0.1")

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -5,8 +5,7 @@
     associated_type_bounds,
     never_type,
     try_blocks,
-    hash_drain_filter,
-    str_split_once
+    hash_drain_filter
 )]
 #![warn(rust_2018_idioms)]
 #![warn(unused_lifetimes)]

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -2372,7 +2372,7 @@ fn compute_type_parameters(cx: &CodegenCx<'ll, 'tcx>, ty: Ty<'tcx>) -> &'ll DIAr
     fn get_parameter_names(cx: &CodegenCx<'_, '_>, generics: &ty::Generics) -> Vec<Symbol> {
         let mut names = generics
             .parent
-            .map_or(vec![], |def_id| get_parameter_names(cx, cx.tcx.generics_of(def_id)));
+            .map_or_else(Vec::new, |def_id| get_parameter_names(cx, cx.tcx.generics_of(def_id)));
         names.extend(generics.params.iter().map(|param| param.name));
         names
     }