Revert "Remove static constructors from DispatcherQueueProxyHandler.I…

…mpl"

This reverts commit d952216.
This optimization currently works but results in fragile code as it's relying on an implementation detail which could change in the future. This could be reverted again latere on if/when we got explicit support for alignment for RVA fields (or, support for constant unmanaged buffers built-in).

src/Projections/Reunion/Microsoft.UI.Dispatching.DispatcherQueueSynchronizationContext.DispatcherQueueProxyHandler.cs

@@ -135,44 +135,17 @@ private static class Impl
                 /// <summary>
                 /// The GUID for the <c>IUnknown</c> COM interface.
                 /// </summary>
-                private static ref readonly Guid GuidOfIUnknown
-                {
-                    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                    get
-                    {
-                        ReadOnlySpan<byte> data = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46 };
-
-                        return ref Unsafe.As<byte, Guid>(ref MemoryMarshal.GetReference(data));
-                    }
-                }
+                private static readonly Guid GuidOfIUnknown = new(0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
 
                 /// <summary>
                 /// The GUID for the <c>IAgileObject</c> WinRT interface.
                 /// </summary>
-                private static ref readonly Guid GuidOfIAgileObject
-                {
-                    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                    get
-                    {
-                        ReadOnlySpan<byte> data = new byte[] { 0x94, 0xEA, 0x2B, 0x94, 0xE9, 0xCC, 0x49, 0xE0, 0xC0, 0xFF, 0xEE, 0x64, 0xCA, 0x8F, 0x5B, 0x90 };
-
-                        return ref Unsafe.As<byte, Guid>(ref MemoryMarshal.GetReference(data));
-                    }
-                }
+                private static readonly Guid GuidOfIAgileObject = new(0x94EA2B94, 0xE9CC, 0x49E0, 0xC0, 0xFF, 0xEE, 0x64, 0xCA, 0x8F, 0x5B, 0x90);
 
                 /// <summary>
                 /// The GUID for the <c>IDispatcherQueueHandler</c> WinRT interface.
                 /// </summary>
-                private static ref readonly Guid GuidOfIDispatcherQueueHandler
-                {
-                    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                    get
-                    {
-                        ReadOnlySpan<byte> data = new byte[] { 0x2E, 0x08, 0x72, 0xA9, 0x4E, 0x29, 0x5F, 0x14, 0xB6, 0x88, 0xFB, 0x96, 0xD5, 0xF9, 0xD5, 0xF8 };
-
-                        return ref Unsafe.As<byte, Guid>(ref MemoryMarshal.GetReference(data));
-                    }
-                }
+                private static readonly Guid GuidOfIDispatcherQueueHandler = new(0x2E0872A9, 0x4E29, 0x5F14, 0xB6, 0x88, 0xFB, 0x96, 0xD5, 0xF9, 0xD5, 0xF8);
 
                 /// <summary>
                 /// Implements <c>IUnknown.QueryInterface(REFIID, void**)</c>.