Address PR feedback

Author: stephentoub

src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime/UseExceptionThrowHelpers.cs

@@ -181,7 +181,7 @@ aooreThrowIfGreaterThan is not null || aooreThrowIfGreaterThanOrEqual is not nul
                     {
                         if (aneThrowIfNull is not null &&
                             IsParameterNullCheck(condition.Condition, out IParameterReferenceOperation? nullCheckParameter) &&
-                            nullCheckParameter.Type.TypeKind == TypeKind.Class)
+                            nullCheckParameter.Type.IsReferenceType)
                         {
                             context.ReportDiagnostic(condition.CreateDiagnostic(
                                 UseArgumentNullExceptionThrowIfNullRule,

src/NetAnalyzers/UnitTests/Microsoft.NetCore.Analyzers/Runtime/UseExceptionThrowHelpersTests.cs

@@ -187,6 +187,21 @@ void GenericMethod<T>(T arg)
     {
         if (arg is null) throw new ArgumentNullException(nameof(arg));
     }
+
+    void GenericMethodWithClassConstraint<T>(T arg) where T : class
+    {
+        {|CA1510:if (arg is null) throw new ArgumentNullException(nameof(arg));|}
+    }
+
+    void GenericMethodWithTypeConstraint<T>(T arg) where T : C
+    {
+        {|CA1510:if (arg is null) throw new ArgumentNullException(nameof(arg));|}
+    }
+
+    void GenericMethodWithInterfaceConstraint<T>(T arg) where T : IDisposable
+    {
+        if (arg is null) throw new ArgumentNullException(nameof(arg));
+    }
 }
 
 class GenericType<T>
@@ -288,6 +303,21 @@ void GenericMethod<T>(T arg)
     {
         if (arg is null) throw new ArgumentNullException(nameof(arg));
     }
+
+    void GenericMethodWithClassConstraint<T>(T arg) where T : class
+    {
+        ArgumentNullException.ThrowIfNull(arg);
+    }
+
+    void GenericMethodWithTypeConstraint<T>(T arg) where T : C
+    {
+        ArgumentNullException.ThrowIfNull(arg);
+    }
+
+    void GenericMethodWithInterfaceConstraint<T>(T arg) where T : IDisposable
+    {
+        if (arg is null) throw new ArgumentNullException(nameof(arg));
+    }
 }
 
 class GenericType<T>