Collect files -> editions mapping after expansion when out-of-process

Applies the equivalent of rust-lang#1513 in the out-of-process compilation case

Author: Xanewok

rls-rustc/src/lib.rs

@@ -98,14 +98,12 @@ impl Callbacks for ShimCalls {
         Compilation::Continue
     }
 
-    fn after_analysis(&mut self, compiler: &interface::Compiler) -> Compilation {
+    fn after_expansion(&mut self, compiler: &interface::Compiler) -> Compilation {
         let callbacks = match self.callbacks.as_ref() {
             Some(callbacks) => callbacks,
             None => return Compilation::Continue,
         };
 
-        use rustc_save_analysis::CallbackHandler;
-
         let sess = compiler.session();
         let input = compiler.input();
         let crate_name = compiler.crate_name().unwrap().peek().clone();
@@ -138,6 +136,20 @@ impl Callbacks for ShimCalls {
             eprintln!("Can't send input files as part of a compilation callback: {:?}", e);
         }
 
+        Compilation::Continue
+    }
+
+    fn after_analysis(&mut self, compiler: &interface::Compiler) -> Compilation {
+        let callbacks = match self.callbacks.as_ref() {
+            Some(callbacks) => callbacks,
+            None => return Compilation::Continue,
+        };
+
+        use rustc_save_analysis::CallbackHandler;
+
+        let input = compiler.input();
+        let crate_name = compiler.crate_name().unwrap().peek().clone();
+
         // Guaranteed to not be dropped yet in the pipeline thanks to the
         // `config.opts.debugging_opts.save_analysis` value being set to `true`.
         let expanded_crate = &compiler.expansion().unwrap().peek().0;