Fix IOpeartion.Syntax property of BoundDelegateCreationExpression in C#

The method binding syntax should be the argument of the creation expression

src/Compilers/CSharp/Portable/BoundTree/Expression.cs

@@ -494,6 +494,8 @@ IExpression IMemberReferenceExpression.Instance
        
         protected override OperationKind ExpressionKind => OperationKind.MethodBindingExpression;
 
+        SyntaxNode IOperation.Syntax => this.Argument.Syntax;
+
         public override void Accept(IOperationVisitor visitor)
         {
             visitor.VisitMethodBindingExpression(this);

src/Compilers/CSharp/Test/Semantic/Diagnostics/OperationAnalyzerTests.cs

@@ -1107,14 +1107,12 @@ private void Mumbler(object sender, System.EventArgs args)
             .VerifyDiagnostics()
             .VerifyAnalyzerDiagnostics(new DiagnosticAnalyzer[] { new MemberReferenceAnalyzer() }, null, null, false,
                 Diagnostic(MemberReferenceAnalyzer.HandlerAddedDescriptor.Id, "Mumble += new MumbleEventHandler(Mumbler)").WithLocation(10, 9),
-                Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble += new MumbleEventHandler(Mumbler)").WithLocation(10, 9),
-                Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "new MumbleEventHandler(Mumbler)").WithLocation(10, 19),
+                Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "Mumbler").WithLocation(10, 42),
                 Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble").WithLocation(11, 9),
                 Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble").WithLocation(12, 20),
                 Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "Mumbler").WithLocation(13, 32),
                 Diagnostic(MemberReferenceAnalyzer.HandlerRemovedDescriptor.Id, "Mumble -= new MumbleEventHandler(Mumbler)").WithLocation(15, 9),
-                Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble -= new MumbleEventHandler(Mumbler)").WithLocation(15, 9),
-                Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "new MumbleEventHandler(Mumbler)").WithLocation(15, 19)
+                Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "Mumbler").WithLocation(15, 42)
                 );
         }
         

src/Compilers/Core/CodeAnalysisTest/Diagnostics/OperationTestAnalyzer.cs

@@ -951,17 +951,7 @@ public sealed override void Initialize(AnalysisContext context)
                  (operationContext) =>
                  {
                      IEventAssignmentExpression eventAssignment = (IEventAssignmentExpression)operationContext.Operation;
-                     if (eventAssignment.Event.Name == "Mumble")
-                     {
                      operationContext.ReportDiagnostic(Diagnostic.Create(eventAssignment.Adds? HandlerAddedDescriptor : HandlerRemovedDescriptor, operationContext.Operation.Syntax.GetLocation()));
-                     }
-                 },
-                 OperationKind.EventAssignmentExpression);
-
-            context.RegisterOperationAction(
-                (operationContext) =>
-                {
-                    operationContext.ReportDiagnostic(Diagnostic.Create(EventReferenceDescriptor, operationContext.Operation.Syntax.GetLocation()));
                  },
                  OperationKind.EventAssignmentExpression);
 

src/Compilers/VisualBasic/Test/Semantic/Diagnostics/OperationAnalyzerTests.vb

@@ -1163,13 +1163,11 @@ End Class
             comp.VerifyDiagnostics()
             comp.VerifyAnalyzerDiagnostics({New MemberReferenceAnalyzer}, Nothing, Nothing, False,
                  Diagnostic(MemberReferenceAnalyzer.HandlerAddedDescriptor.Id, "AddHandler Mumble, New MumbleEventHandler(AddressOf Mumbler)").WithLocation(7, 9),
-                 Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "AddHandler Mumble, New MumbleEventHandler(AddressOf Mumbler)").WithLocation(7, 9),
                  Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble").WithLocation(7, 20),
                  Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "AddressOf Mumbler").WithLocation(7, 51),
                  Diagnostic(MemberReferenceAnalyzer.FieldReferenceDescriptor.Id, "Mumble").WithLocation(8, 20),
                  Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "AddressOf Mumbler").WithLocation(10, 39),
                  Diagnostic(MemberReferenceAnalyzer.HandlerRemovedDescriptor.Id, "RemoveHandler Mumble, AddressOf Mumbler").WithLocation(12, 9),
-                 Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "RemoveHandler Mumble, AddressOf Mumbler").WithLocation(12, 9),
                  Diagnostic(MemberReferenceAnalyzer.EventReferenceDescriptor.Id, "Mumble").WithLocation(12, 23),
                  Diagnostic(MemberReferenceAnalyzer.MethodBindingDescriptor.Id, "AddressOf Mumbler").WithLocation(12, 31))
         End Sub