Fix Clippy lints in bootstrap

Author: flip1995

src/bootstrap/src/core/build_steps/perf.rs

@@ -196,7 +196,7 @@ Consider setting `rust.debuginfo-level = 1` in `bootstrap.toml`."#);
             apply_shared_opts(&mut cmd, opts);
             cmd.run(builder);
 
-            println!("You can find the results at `{}`", &results_dir.display());
+            println!("You can find the results at `{}`", results_dir.display());
         }
         PerfCommand::Benchmark { id, opts } => {
             cmd.arg("bench_local");

src/bootstrap/src/core/build_steps/setup.rs

@@ -312,7 +312,7 @@ fn attempt_toolchain_link(builder: &Builder<'_>, stage_path: &str) {
         eprintln!(
             "To manually link stage 1 build to `stage1` toolchain, run:\n
             `rustup toolchain link stage1 {}`",
-            &stage_path
+            stage_path
         );
     }
 }

src/bootstrap/src/core/build_steps/test.rs

@@ -1349,9 +1349,9 @@ impl Step for Tidy {
     /// for the `dev` or `nightly` channels.
     fn run(self, builder: &Builder<'_>) {
         let mut cmd = builder.tool_cmd(Tool::Tidy);
-        cmd.arg(format!("--root-path={}", &builder.src.display()));
-        cmd.arg(format!("--cargo-path={}", &builder.initial_cargo.display()));
-        cmd.arg(format!("--output-dir={}", &builder.out.display()));
+        cmd.arg(format!("--root-path={}", builder.src.display()));
+        cmd.arg(format!("--cargo-path={}", builder.initial_cargo.display()));
+        cmd.arg(format!("--output-dir={}", builder.out.display()));
         // Tidy is heavily IO constrained. Still respect `-j`, but use a higher limit if `jobs` hasn't been configured.
         let jobs = builder.config.jobs.unwrap_or_else(|| {
             8 * std::thread::available_parallelism().map_or(1, std::num::NonZeroUsize::get) as u32
@@ -2576,7 +2576,7 @@ Please disable assertions with `rust.debug-assertions = false`.
 
             builder.info(&format!(
                 "Check compiletest suite={} mode={} compare_mode={} ({} -> {})",
-                suite, mode, compare_mode, &test_compiler.host, target
+                suite, mode, compare_mode, test_compiler.host, target
             ));
             let _time = helpers::timeit(builder);
             try_run_tests(builder, &mut cmd, false);