removed unused options (#22389)

src/Compilers/CSharp/Portable/Compilation/CSharpSemanticModel.cs

@@ -469,13 +469,6 @@ protected override IOperation GetOperationCore(SyntaxNode node, CancellationToke
             return this.GetOperationWorker(csnode, cancellationToken);
         }
 
-        internal enum GetOperationOptions
-        {
-            Highest,
-            Lowest,
-            Parent
-        }
-
         internal virtual IOperation GetOperationWorker(CSharpSyntaxNode node, CancellationToken cancellationToken)
         {
             return null;

src/Compilers/VisualBasic/Portable/Compilation/SemanticModel.vb

@@ -132,12 +132,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                  TypeOf (node) Is OrderingSyntax)
         End Function
 
-        Friend Enum GetOperationOptions
-            Lowest
-            Highest
-            Parent
-        End Enum
-
         Protected Overrides Function GetOperationCore(node As SyntaxNode, cancellationToken As CancellationToken) As IOperation
             Dim vbnode = DirectCast(node, VisualBasicSyntaxNode)
             CheckSyntaxNode(vbnode)