[D3D12] Put shared memory in PS resource state because vfetch seems allowed in PS

src/xenia/gpu/d3d12/shared_memory.cc

@@ -538,8 +538,10 @@ void SharedMemory::TransitionBuffer(D3D12_RESOURCE_STATES new_state) {
 }
 
 void SharedMemory::UseForReading() {
+  // Vertex fetch also seems to be allowed in pixel shaders.
   TransitionBuffer(D3D12_RESOURCE_STATE_INDEX_BUFFER |
-                   D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+                   D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE |
+                   D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE);
 }
 
 void SharedMemory::UseForWriting() {