Migrate run-make/rustdoc-map-file to rmake

Author: GuillaumeGomez

tests/run-make/rustdoc-map-file/Makefile

@@ -0,0 +1,14 @@
+use run_make_support::{rustdoc, tmp_dir};
+use std::process::Command;
+
+fn main() {
+    let out_dir = tmp_dir().join("out");
+    rustdoc()
+        .input("foo.rs")
+        .arg("-Zunstable-options")
+        .arg("--generate-redirect-map")
+        .output(&out_dir)
+        .run();
+    assert!(
+        Command::new("python").arg("validate_json.py").arg(&out_dir).status().unwrap().success());
+}