Add LibraryElementForLink.context getter.

pkg/analyzer/test/src/summary/linker_test.dart

Index: pkg/analyzer/test/src/summary/linker_test.dart
diff --git a/pkg/analyzer/test/src/summary/linker_test.dart b/pkg/analyzer/test/src/summary/linker_test.dart
index 0cc98ea0aad484a2ac735382d9dbab19516bc73f..530270af8e7d6632498c33df154a6252a5974519 100644
--- a/pkg/analyzer/test/src/summary/linker_test.dart
+++ b/pkg/analyzer/test/src/summary/linker_test.dart
@@ -439,4 +439,22 @@ class D extends C {
         unorderedEquals([libA.libraryCycleForLink, libB.libraryCycleForLink]));
     expect(libraryCycle.libraries, [testLibrary]);
   }
+
+  void test_multiplyInheritedExecutable_differentSignatures() {
+    createLinker('''
+class B {
+  void f() {}
+}
+abstract class I {
+   f();
+}
+class C extends B with I {}
+class D extends C {
+  void f() {}
+}
+''');
+    LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
+    library.libraryCycleForLink.ensureLinked();
+    // No assertions--just make sure it doesn't crash.
+  }
 }