Fix escaping of char literals in debugger output.

src/AddIns/Debugger/Debugger.AddIn/NRefactory/ExpressionEvaluationVisitor.cs

@@ -490,11 +490,7 @@ namespace Debugger.AddIn
 				}
 				sb.Append("}");
 				return sb.ToString();
-			} else if (val.Type.IsKnownType(KnownTypeCode.Char)) {
-				return "'" + TextWriterTokenWriter.ConvertChar((char)val.PrimitiveValue) + "'";
-			} else if (val.Type.IsKnownType(KnownTypeCode.String)) {
-				return "\"" + TextWriterTokenWriter.ConvertString((string)val.PrimitiveValue) + "\"";
-			} else if (val.Type.IsPrimitiveType()) {
+			} else if (val.Type.IsKnownType(KnownTypeCode.String) || val.Type.IsPrimitiveType()) {
 				return TextWriterTokenWriter.PrintPrimitiveValue(val.PrimitiveValue);
 			} else {
 				return val.InvokeToString(evalThread);

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/OutputVisitor/TextWriterOutputFormatter.cs

@@ -333,7 +333,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		/// Gets the escape sequence for the specified character.
 		/// </summary>
 		/// <remarks>This method does not convert ' or ".</remarks>
-		public static string ConvertChar(char ch)
+		static string ConvertChar(char ch)
 		{
 			switch (ch) {
 				case '\\':