Rollup merge of #147604 - Kivooeo:tear-prev-pr, r=nnethercote

Some clippy cleanups in compiler

This extracts some of the changes from https://github.com/rust-lang/rust/pull/147591 that were worth preserving in my opinion

r? compiler

compiler/rustc_llvm/build.rs

@@ -197,7 +197,7 @@ fn main() {
 
         // Include path contains host directory, replace it with target
         if is_crossed && flag.starts_with("-I") {
-            cfg.flag(&flag.replace(&host, &target));
+            cfg.flag(flag.replace(&host, &target));
             continue;
         }