[D3D12] 32bpb and 128bpb untiling, fix 3D tiled offset

src/xenia/gpu/d3d12/shaders/texture_load_32bpb.cs.hlsl

@@ -0,0 +1,22 @@
+#include "texture_copy.hlsli"
+
+[numthreads(8, 32, 1)]
+void main(uint3 xe_thread_id : SV_DispatchThreadID) {
+  // 1 thread = 4 uint blocks.
+  uint3 block_index = xe_thread_id;
+  block_index.x <<= 2u;
+  [branch] if (any(block_index >= xe_texture_copy_size)) {
+    return;
+  }
+  uint4 block_offsets_guest =
+      XeTextureCopyGuestBlockOffsets(block_index, 4u, 2u);
+  uint4 blocks = uint4(xe_texture_copy_source.Load(block_offsets_guest.x),
+                       xe_texture_copy_source.Load(block_offsets_guest.y),
+                       xe_texture_copy_source.Load(block_offsets_guest.z),
+                       xe_texture_copy_source.Load(block_offsets_guest.w));
+  blocks = XeByteSwap(blocks, xe_texture_copy_endianness);
+  uint block_offset_host = XeTextureHostLinearOffset(
+      block_index, xe_texture_copy_size.y, xe_texture_copy_host_pitch, 4u) +
+      xe_texture_copy_host_base;
+  xe_texture_copy_dest.Store4(block_offset_host, blocks);
+}