Fix namespace imports

src/ExpressionEvaluator/CSharp/Test/ExpressionCompiler/UsingDebugInfoTests.cs

@@ -20,6 +20,7 @@
 namespace Microsoft.CodeAnalysis.CSharp.ExpressionEvaluator.UnitTests
 {
     using System;
+    using Debugging;
     using static MethodDebugInfoValidation;
 
     public class UsingDebugInfoTests : ExpressionCompilerTestBase

src/ExpressionEvaluator/Core/Test/ExpressionCompiler/MethodDebugInfoBytes.cs

@@ -5,6 +5,7 @@
 using Roslyn.Utilities;
 using Microsoft.DiaSymReader;
 using Xunit;
+using Microsoft.CodeAnalysis.Debugging;
 
 namespace Microsoft.CodeAnalysis.ExpressionEvaluator.UnitTests
 {

src/ExpressionEvaluator/VisualBasic/Test/ExpressionCompiler/DteeTests.vb

@@ -3,6 +3,7 @@
 Imports System.Collections.Immutable
 Imports System.IO
 Imports System.Threading
+Imports Microsoft.CodeAnalysis.Debugging
 Imports Microsoft.CodeAnalysis.ExpressionEvaluator
 Imports Microsoft.CodeAnalysis.ExpressionEvaluator.UnitTests
 Imports Microsoft.CodeAnalysis.VisualBasic.Symbols

src/ExpressionEvaluator/VisualBasic/Test/ExpressionCompiler/ImportDebugInfoTests.vb

@@ -4,6 +4,7 @@ Imports System.Collections.Immutable
 Imports System.Reflection
 Imports System.Runtime.InteropServices
 Imports Microsoft.CodeAnalysis.CodeGen
+Imports Microsoft.CodeAnalysis.Debugging
 Imports Microsoft.CodeAnalysis.Emit
 Imports Microsoft.CodeAnalysis.ExpressionEvaluator.UnitTests
 Imports Microsoft.CodeAnalysis.Test.Utilities