Auto merge of #43730 - nrc:driver-shim, r=eddyb

Make the driver API a little more useful for a tools shim

Example use case: https://github.com/nrc/rls-rustc

src/librustdoc/core.rs

@@ -155,7 +155,9 @@ pub fn run_core(search_paths: SearchPaths,
     target_features::add_configuration(&mut cfg, &sess);
     sess.parse_sess.config = cfg;
 
-    let krate = panictry!(driver::phase_1_parse_input(&sess, &input));
+    let krate = panictry!(driver::phase_1_parse_input(&driver::CompileController::basic(),
+                                                      &sess,
+                                                      &input));
 
     let name = link::find_crate_name(Some(&sess), &krate.attrs, &input);
 

src/librustdoc/test.rs

@@ -91,7 +91,9 @@ pub fn run(input: &str,
     sess.parse_sess.config =
         config::build_configuration(&sess, config::parse_cfgspecs(cfgs.clone()));
 
-    let krate = panictry!(driver::phase_1_parse_input(&sess, &input));
+    let krate = panictry!(driver::phase_1_parse_input(&driver::CompileController::basic(),
+                                                      &sess,
+                                                      &input));
     let driver::ExpansionResult { defs, mut hir_forest, .. } = {
         phase_2_configure_and_expand(
             &sess, &cstore, krate, None, "rustdoc-test", None, MakeGlobMap::No, |_| Ok(())