[GPU] Explicitly cast bit field values in std::min/max

According to the integral promotion rules https://eel.is/c++draft/conv.prom#5.sentence-1 bit fields can be promoted to `int` if it's wide enough to store their value, and then otherwise, to `unsigned int`. Hopefully fixes Clang building (the `width_div_8` case).

src/xenia/gpu/texture_info.cc

@@ -73,7 +73,8 @@ bool TextureInfo::Prepare(const xe_gpu_texture_fetch_t& fetch,
   info.pitch = fetch.pitch << 5;
 
   info.mip_min_level = fetch.mip_min_level;
-  info.mip_max_level = std::max(fetch.mip_min_level, fetch.mip_max_level);
+  info.mip_max_level =
+      std::max(uint32_t(fetch.mip_min_level), uint32_t(fetch.mip_max_level));
 
   info.is_tiled = fetch.tiled;
   info.has_packed_mips = fetch.packed_mips;