bootstrap: Allow installing llvm-tools

Author: mkroening

src/bootstrap/builder.rs

@@ -744,6 +744,7 @@ impl<'a> Builder<'a> {
                 install::RustDemangler,
                 install::Clippy,
                 install::Miri,
+                install::LlvmTools,
                 install::Analysis,
                 install::Src,
                 install::Rustc

src/bootstrap/install.rs

@@ -205,6 +205,12 @@ install!((self, builder, _config),
             .expect("missing miri");
         install_sh(builder, "miri", self.compiler.stage, Some(self.target), &tarball);
     };
+    LlvmTools, alias = "llvm-tools", Self::should_build(_config), only_hosts: true, {
+        let tarball = builder
+            .ensure(dist::LlvmTools { target: self.target })
+            .expect("missing llvm-tools");
+        install_sh(builder, "llvm-tools", self.compiler.stage, Some(self.target), &tarball);
+    };
     Rustfmt, alias = "rustfmt", Self::should_build(_config), only_hosts: true, {
         if let Some(tarball) = builder.ensure(dist::Rustfmt {
             compiler: self.compiler,