Rework Nvdec and VIC to fix out-of-order videos, and speed up decoding.

src/video_core/memory_manager.h

@@ -43,6 +43,8 @@ public:
                            u64 big_page_bits_ = 16, u64 page_bits_ = 12);
     ~MemoryManager();
 
+    static constexpr bool HAS_FLUSH_INVALIDATION = true;
+
     size_t GetID() const {
         return unique_identifier;
     }