[BACKEND] Added Int8 mma (#440)

include/triton/codegen/analysis/layout.h

@@ -268,6 +268,7 @@ public:
   void set_mma_vec(int mma_vec)             { mma_vec_ = mma_vec; }
   int  get_mma_vec()                        { return mma_vec_;}
   int  get_mma_strided()                    { return mma_strided_; }
+  bool allow_swizzle() const                { return allow_swizzle_; }
   data_layout* get_arg_layout()             { return arg_layout_; }
 
 private:
@@ -281,6 +282,7 @@ private:
   data_layout* arg_layout_;
   int mma_vec_;
   int mma_strided_;
+  bool allow_swizzle_ = true;
   target *tgt_;
 };