Include 'invokeMethodRef' reference as a linking dependency.

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 4867 matching lines @@
         case UnlinkedExprOperation.makeTypedMap:
           refPtr += 2;
           intPtr++;
           break;
         case UnlinkedExprOperation.assignToRef:
           // TODO(paulberry): if this reference refers to a variable, should it
           // be considered a type inference dependency?
           refPtr++;
           break;
         case UnlinkedExprOperation.invokeMethodRef:
           // TODO(paulberry): if this reference refers to a variable, should it

[Paul Berry, 2017/04/04 21:31:48]

We can get rid of this TODO now.

           // be considered a type inference dependency?
-          refPtr++;
+          EntityRef ref = unlinkedConst.references[refPtr++];
+          TypeInferenceNode dependency =
+              compilationUnit.resolveRef(ref.reference).asTypeInferenceNode;
+          if (dependency != null) {
+            dependencies.add(dependency);
+          }
           intPtr += 2;
           int numTypeArguments = unlinkedConst.ints[intPtr++];
           refPtr += numTypeArguments;
           break;
         case UnlinkedExprOperation.invokeMethod:
           intPtr += 2;
           int numTypeArguments = unlinkedConst.ints[intPtr++];
           refPtr += numTypeArguments;
           break;
         case UnlinkedExprOperation.typeCast:
@@ skipping 395 matching lines @@
 }
 
 /**
  * This exception is thrown when [ExprTypeComputer] cannot inference the type.
  */
 class _InferenceFailedError {
   final String message;
 
   _InferenceFailedError(this.message);
 }