Address feedback: tuples cannot have constant value

src/Compilers/CSharp/Portable/Operations/CSharpOperationFactory.cs

@@ -1197,7 +1197,7 @@ private ITupleExpression CreateBoundTupleExpressionOperation(BoundTupleExpressio
             Lazy<ImmutableArray<IOperation>> elements = new Lazy<ImmutableArray<IOperation>>(() => boundTupleExpression.Arguments.SelectAsArray(element => Create(element)));
             SyntaxNode syntax = boundTupleExpression.Syntax;
             ITypeSymbol type = boundTupleExpression.Type;
-            Optional<object> constantValue = ConvertToOptional(boundTupleExpression.ConstantValue);
+            Optional<object> constantValue = default(Optional<object>);
             return new LazyTupleExpression(elements, syntax, type, constantValue);
         }
 

src/Compilers/VisualBasic/Portable/Operations/VisualBasicOperationFactory.vb

@@ -1015,7 +1015,7 @@ Namespace Microsoft.CodeAnalysis.Semantics
             Dim elements As New Lazy(Of ImmutableArray(Of IOperation))(Function() boundTupleExpression.Arguments.SelectAsArray(Function(element) Create(element)))
             Dim syntax As SyntaxNode = boundTupleExpression.Syntax
             Dim type As ITypeSymbol = boundTupleExpression.Type
-            Dim constantValue As [Optional](Of Object) = ConvertToOptional(boundTupleExpression.ConstantValueOpt)
+            Dim constantValue As [Optional](Of Object) = Nothing
             Return New LazyTupleExpression(elements, syntax, type, constantValue)
         End Function