Generate all imported libraries.

lib/kernel.dart

Index: lib/kernel.dart
diff --git a/lib/kernel.dart b/lib/kernel.dart
index 76c22755e0d5776b3cb9ef123d8ac6fe13cf99b1..cb12e3a8ede091a80eb90ee1c85f978bb08d845d 100644
--- a/lib/kernel.dart
+++ b/lib/kernel.dart
@@ -563,7 +563,7 @@ class Kernel {
     }
     while (notProcessed.isNotEmpty) {
       LibraryElement library = notProcessed.removeFirst();
-      ir.Library irLibrary = libraries[library];
+      ir.Library irLibrary = libraryToIr(library);
       for (ImportElement import in library.imports) {
         if (seen.add(import.importedLibrary)) {
           processLater(import.importedLibrary);
@@ -588,6 +588,7 @@ class Kernel {
         result.add(irLibrary);
       }
     }
+    processWorkQueue();
     return result;
   }