Protect kernel launch syntax from clang-format

test/gpu_common.h

@@ -55,7 +55,10 @@ void run_on_gpu(const Kernel& ker, int n, const Input& in, Output& out) {
                                                             typename std::decay<decltype(*d_out)>::type>),
                      dim3(Grids), dim3(Blocks), 0, 0, ker, n, d_in, d_out);
 #else
+  // Various versions of clang-format incorrectly add spaces to the kernel launch brackets.
+  // clang-format off
   run_on_gpu_meta_kernel<<<Grids, Blocks>>>(ker, n, d_in, d_out);
+  // clang-format on
 #endif
   // Pre-launch errors.
   gpuError_t err = gpuGetLastError();