Disambiguate setters and getters when patching DDC SDK.

pkg/dev_compiler/tool/patch_sdk.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, 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.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:math' as math;
@@ skipping 331 matching lines @@
     } else {
       mergeDeclarations.add(node);
     }
   }
 
   @override
   visitFunctionBody(node) {} // skip method bodies
 }
 
 String _qualifiedName(Declaration node) {
+  var result = "";
+
   var parent = node.parent;
-  var className = '';
   if (parent is ClassDeclaration) {
-    className = parent.name.name + '.';
+    result = "${parent.name.name}.";
   }
+
   var name = (node as dynamic).name;
-  return className + (name != null ? name.name : '');
+  if (name != null) result += name.name;
+
+  // Make sure setters and getters don't collide.
+  if ((node is FunctionDeclaration || node is MethodDeclaration) &&
+      (node as dynamic).isSetter) {
+    result += "=";
+  }
+
+  return result;
 }
 
 bool _isPatch(AnnotatedNode node) => node.metadata.any(_isPatchAnnotation);
 
 bool _isPatchAnnotation(Annotation m) =>
     m.name.name == 'patch' && m.constructorName == null && m.arguments == null;
 
 /// Editable string buffer.
 ///
 /// Applies a series of edits (insertions, removals, replacements) using
@@ skipping 85 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(true);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }