add TestFloatParse to tools for bootstrap

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

@@ -3550,7 +3550,7 @@ impl Step for TestFloatParse {
         let crate_name = self.path.components().last().unwrap().as_os_str().to_str().unwrap();
 
         if !builder.download_rustc() {
-            builder.ensure(compile::Std::new(compiler, self.host));
+            builder.ensure(tool::TestFloatParse { path: path.into(), host: self.host });
         }
 
         // Run any unit tests in the crate

src/bootstrap/src/core/build_steps/tool.rs

@@ -1096,6 +1096,50 @@ tool_extended!((self, builder),
     Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true, add_bins_to_sysroot = ["rustfmt", "cargo-fmt"];
 );
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TestFloatParse {
+    pub path: PathBuf,
+    pub host: TargetSelection,
+}
+
+impl Step for TestFloatParse {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+    const DEFAULT: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/etc/test-float-parse")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        for path in run.paths {
+            let path = path.assert_single_path().path.clone();
+            run.builder.ensure(Self { path, host: run.target });
+        }
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        let bootstrap_host = builder.config.build;
+        let compiler = builder.compiler(builder.top_stage, bootstrap_host);
+        let path: &'static str =
+            Box::leak(self.path.to_str().unwrap().to_string().into_boxed_str());
+
+        if !builder.download_rustc() {
+            builder.ensure(ToolBuild {
+                compiler,
+                target: bootstrap_host,
+                tool: "test-float-parse",
+                mode: Mode::ToolStd,
+                path,
+                source_type: SourceType::InTree,
+                extra_features: Vec::new(),
+                allow_features: "",
+                cargo_args: Vec::new(),
+            });
+        }
+    }
+}
+
 impl<'a> Builder<'a> {
     /// Gets a `BootstrapCommand` which is ready to run `tool` in `stage` built for
     /// `host`.