Adding class target to RequiresDynamicCodeAttribute

src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/RequiresDynamicCodeAttribute.cs

@@ -10,7 +10,7 @@ namespace System.Diagnostics.CodeAnalysis
     /// <remarks>
     /// This allows tools to understand which methods are unsafe to call when compiling ahead of time.
     /// </remarks>
-    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor, Inherited = false)]
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class, Inherited = false)]
     public sealed class RequiresDynamicCodeAttribute : Attribute
     {
         /// <summary>

src/libraries/System.Runtime/ref/System.Runtime.cs

@@ -7368,7 +7368,7 @@ public RequiresAssemblyFilesAttribute(string message) { }
         public string? Message { get { throw null; } }
         public string? Url { get { throw null; } set { } }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Constructor | System.AttributeTargets.Method | AttributeTargets.Class, Inherited=false)]
     public sealed partial class RequiresDynamicCodeAttribute : System.Attribute
     {
         public RequiresDynamicCodeAttribute(string message) { }