Use Nullable.GetValueRefOrDefaultRef where possible

Author: Sergio0694

CommunityToolkit.HighPerformance/Extensions/NullableExtensions.cs

@@ -35,7 +35,11 @@ public static class NullableExtensions
     public static ref T DangerousGetValueOrDefaultReference<T>(this ref T? value)
         where T : struct
     {
+#if NET7_0_OR_GREATER
+        return ref Unsafe.AsRef(in Nullable.GetValueRefOrDefaultRef(in value));
+#else
         return ref Unsafe.As<T?, RawNullableData<T>>(ref value).Value;
+#endif
     }
 
     /// <summary>
@@ -51,12 +55,17 @@ public static unsafe ref T DangerousGetValueOrNullReference<T>(ref this T? value
     {
         if (value.HasValue)
         {
+#if NET7_0_OR_GREATER
+            return ref Unsafe.AsRef(in Nullable.GetValueRefOrDefaultRef(in value));
+#else
             return ref Unsafe.As<T?, RawNullableData<T>>(ref value).Value;
+#endif
         }
 
         return ref Unsafe.NullRef<T>();
     }
 
+#if !NET7_0_OR_GREATER
     /// <summary>
     /// Mapping type that reflects the internal layout of the <see cref="Nullable{T}"/> type.
     /// See https://github.com/dotnet/runtime/blob/master/src/libraries/System.Private.CoreLib/src/System/Nullable.cs.
@@ -70,6 +79,7 @@ private struct RawNullableData<T>
         public T Value;
 #pragma warning restore CS0649
     }
+#endif
 }
 
 #endif