Add warning log for Pow2 tessellation partitioning

src/shader_recompiler/backend/spirv/emit_spirv.cpp

@@ -239,6 +239,8 @@ spv::ExecutionMode ExecutionMode(AmdGpu::TessellationPartitioning spacing) {
     case AmdGpu::TessellationPartitioning::Pow2:
         // Pow2 rounds tessellation factors to the nearest power of 2, which has no
         // direct Vulkan equivalent. SpacingEqual (integer) is the closest match.
+        LOG_WARNING(Render_Vulkan,
+                    "Tessellation partitioning Pow2 has no Vulkan equivalent, falling back to SpacingEqual");
         return spv::ExecutionMode::SpacingEqual;
     default:
         break;