Update torchao/csrc/cpu/aten_kernels/float8_linear.cpp

Author: Xia-Weiwen

torchao/csrc/cpu/aten_kernels/float8_linear.cpp

@@ -453,7 +453,9 @@ void _float8_linear_impl(
   TORCH_CHECK(weight.size(3) == block_n, "Float8 linear: unexpected weight shape");
   int64_t N = Nc * block_n;
   TORCH_CHECK(K == Kc * block_k, "Float8 linear: weight and input shapes mismatch");
-  auto [parallel_on_M, block_m, Mc, Mc_parallel] = get_m_blocking(M);
+  bool parallel_on_M;
+  int64_t block_m, Mc, Mc_parallel;
+  std::tie(parallel_on_M, block_m, Mc, Mc_parallel) = get_m_blocking(M);
   int64_t num_parallel_blocks = Mc_parallel * Nc;
 
   // scales shape = [Nc, G, block_n]