Buffer Cache: Deduce vertex array limit from memory layout when limit is the highest possible.

src/video_core/memory_manager.cpp

@@ -193,7 +193,7 @@ void MemoryManager::Unmap(GPUVAddr gpu_addr, std::size_t size) {
 }
 
 std::optional<VAddr> MemoryManager::GpuToCpuAddress(GPUVAddr gpu_addr) const {
-    if (gpu_addr >= address_space_size) [[unlikely]] {
+    if (!IsWithinGPUAddressRange(gpu_addr)) [[unlikely]] {
         return std::nullopt;
     }
     if (GetEntry<true>(gpu_addr) != EntryType::Mapped) [[unlikely]] {