Protect kernel launch syntax from clang-format

Antonio Sánchezrequested to merge
cantonios/eigen:formatting into master

Clang-format (at least versions 13-18) introduces spaces in the second set of kernel launch brackets:

  run_on_gpu_meta_kernel<<<Grids, Blocks> > >(ker, n, d_in, d_out);

which causes a syntax error. We need to protect this. All other instances in the codebase seem to be unaffected.

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