[triton/dnn/conv] merged optimizations branch

- Added forward/backward support for strided convolution
- Added support for bias
- Added support for reduction splitting

examples/cpp/dot.cpp

@@ -5,6 +5,7 @@
 #include "triton/driver/backend.h"
 #include "triton/driver/stream.h"
 #include "triton/dnn/gemm.h"
+#include "triton/tools/bench.hpp"
 
 
 int main() {
@@ -52,8 +53,8 @@ int main() {
     triton::dnn::gemm::set_arg(kernel, da, db, dc, M, N, K, dlocks, grid[0], grid[1]);
     stream->enqueue(kernel, grid, {nthreads, 1, 1});
     stream->synchronize();
-    double ts = bench([&](){stream->enqueue(kernel, grid, {nthreads, 1, 1});},
-                      [&](){ stream->synchronize(); }, *context->device());
+    double ts = triton::tools::bench([&](){stream->enqueue(kernel, grid, {nthreads, 1, 1});},
+                      [&](){ stream->synchronize(); }, context->device());
     return  2.*M*N*K / ts * 1e-3;
   };