Fix rustc path construction in perf function.

Author: Sol-Ell

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

@@ -1,4 +1,4 @@
-use std::fmt::{Display, Formatter};
+use std::{env::consts::EXE_EXTENSION, fmt::{Display, Formatter}};
 
 use crate::core::build_steps::compile::{Std, Sysroot};
 use crate::core::build_steps::tool::{RustcPerf, Rustdoc};
@@ -160,7 +160,10 @@ Consider setting `rust.debuginfo-level = 1` in `bootstrap.toml`."#);
     }
 
     let sysroot = builder.ensure(Sysroot::new(compiler));
-    let rustc = sysroot.join("bin/rustc");
+    let mut rustc = sysroot.clone();
+    rustc.push("bin");
+    rustc.push("rustc");
+    rustc.set_extension(EXE_EXTENSION);
 
     let rustc_perf_dir = builder.build.tempdir().join("rustc-perf");
     let results_dir = rustc_perf_dir.join("results");