Add import dependencies to Kernel libraries and use them to resynthesize ImportElement(s) in Analyz…

pkg/front_end/lib/src/kernel_generator_impl.dart

Index: pkg/front_end/lib/src/kernel_generator_impl.dart
diff --git a/pkg/front_end/lib/src/kernel_generator_impl.dart b/pkg/front_end/lib/src/kernel_generator_impl.dart
index 8dd871af4bbda05d5e6ae60740b3f39ff1b49cd3..393aa00c616dfcc2a19c90fb1b1541ca42e3297b 100644
--- a/pkg/front_end/lib/src/kernel_generator_impl.dart
+++ b/pkg/front_end/lib/src/kernel_generator_impl.dart
@@ -75,7 +75,10 @@ Future<CompilerResult> generateKernelInternal(
     }
 
     // All summaries are considered external and shouldn't include source-info.
-    dillTarget.loader.libraries.forEach((lib) => lib.isExternal = true);
+    dillTarget.loader.libraries.forEach((lib) {
+      lib.isExternal = true;
+      lib.dependencies.clear();
+    });
 
     // Linked dependencies are meant to be part of the program so they are not
     // marked external.