Fix output locals in dump (#207)

***NO_CI***

Author: josesimoes

MetadataProcessor.Shared/nanoDumperGenerator.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
@@ -853,7 +853,14 @@ private string PrintSignatureForLocalVar(Collection<VariableDefinition> variable
                 }
                 else if (l.VariableType.IsGenericInstance)
                 {
-                    sig.Append($"class {l.VariableType.FullName}");
+                    if (l.VariableType.IsValueType)
+                    {
+                        sig.Append($"valuetype {l.VariableType.FullName}");
+                    }
+                    else
+                    {
+                        sig.Append($"class {l.VariableType.FullName}");
+                    }
 
                     _tablesContext.TypeSpecificationsTable.TryGetTypeReferenceId(l.VariableType as TypeSpecification, out ushort referenceId);