Fix a linker test by adding support for 'invokeMethodRef' dep.

pkg/analyzer/lib/src/summary/link.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This library is capable of producing linked summaries from unlinked
  * ones (or prelinked ones).  It functions by building a miniature
  * element model to represent the contents of the summaries, and then
  * scanning the element model to gather linked information and adding
  * it to the summary data structures.
@@ skipping 1272 matching lines @@
       List<ConstNode> dependencies,
       UnlinkedConst unlinkedConst,
       CompilationUnitElementForLink compilationUnit) {
     if (unlinkedConst == null) {
       return;
     }
     int refPtr = 0;
     for (UnlinkedConstOperation operation in unlinkedConst.operations) {
       switch (operation) {
         case UnlinkedConstOperation.pushReference:
+        case UnlinkedConstOperation.invokeMethodRef:
           EntityRef ref = unlinkedConst.references[refPtr++];
           ConstVariableNode variable =
               compilationUnit._resolveRef(ref.reference).asConstVariable;
           if (variable != null) {
             dependencies.add(variable);
           }
           break;
         case UnlinkedConstOperation.makeTypedList:
           refPtr++;
           break;
@@ skipping 3060 matching lines @@
       if (type is InterfaceType) {
         Element result = type.lookUpGetter(name, compilationUnit.library);
         result ??= type.lookUpMethod(name, compilationUnit.library);
         return result;
       }
     }
     // TODO(scheglov): implement for propagated types
     return null;
   }
 }