Correct perf_event_names to use character arrays rather than strings. This is because while R2018a isfield() works with a cell array of strings, R2017b doesn't.
Correct perf_event_names to use character arrays rather than strings. This is because while R2018a isfield() works with a cell array of strings, R2017b doesn't.

Chester-Gillon/AVX_matrix_multiply,Chester-Gillon/AVX_matrix_multiply,Chester-Gillon/AVX_matrix_multiply