Remove CaseKind.None and DoLoopKind.None, which were missed in previous commit

src/Compilers/Core/Portable/Operations/CaseKind.cs

@@ -9,8 +9,6 @@ namespace Microsoft.CodeAnalysis.Semantics
     /// </summary>
     public enum CaseKind
     {
-        None = 0x0,
-
         /// <summary>
         /// Indicates case x in C# or Case x in VB.
         /// </summary>

src/Compilers/Core/Portable/Operations/Loops/DoLoopKind.cs

@@ -7,8 +7,6 @@ namespace Microsoft.CodeAnalysis.Semantics
     /// </summary>
     public enum DoLoopKind
     {
-        None = 0x0,
-
         /// <summary>
         /// Indicates a C# 'do while' or a VB 'Do While' loop where the loop condition is executed at the bottom of the loop, i.e. end of the loop iteration.
         /// Loop executes while the loop condition evaluates to <code>true</code>.