Emit anonymous delegates, used for dynamic, in deterministic order

Fixes #1440

src/Compilers/CSharp/Portable/Symbols/AnonymousTypes/AnonymousTypeManager.Templates.cs

@@ -383,7 +383,17 @@ private void GetCreatedSynthesizedDelegates(ArrayBuilder<SynthesizedDelegateSymb
                         builder.Add(template.Delegate);
                     }
                 }
-                // Should be sorted, same as AnonymousTypeTemplates. See VB.
+                builder.Sort(SynthesizedDelegateSymbolComparer.Instance);
+            }
+        }
+
+        private class SynthesizedDelegateSymbolComparer : IComparer<SynthesizedDelegateSymbol>
+        {
+            public static SynthesizedDelegateSymbolComparer Instance = new SynthesizedDelegateSymbolComparer();
+
+            public int Compare(SynthesizedDelegateSymbol x, SynthesizedDelegateSymbol y)
+            {
+                return x.MetadataName.CompareTo(y.MetadataName);
             }
         }
 

src/Compilers/CSharp/Test/Emit/Emit/CompilationEmitTests.cs

@@ -2892,7 +2892,7 @@ class C6
         /// metadata should be deterministic.
         /// </summary>
         [WorkItem(1440, "https://github.com/dotnet/roslyn/issues/1440")]
-        [Fact(Skip = "1440")]
+        [Fact]
         public void SynthesizedDelegateMetadataOrder()
         {
             var source =
@@ -2934,9 +2934,9 @@ static int M(dynamic d, object o)
                     {
                         "<Module>",
                         "<>A{00000004}`3",
+                        "<>A{00000018}`5",
                         "<>F{00000004}`5",
                         "<>F{00000008}`5",
-                        "<>A{00000018}`5",
                         "C1",
                         "C2",
                         "C3",