Initailized c_save instead of 'c" and then removed copying c to c_save.
Because at the start every n_repeats iteration we are copying back c_save to c.
Therefore if we initialize c_save, we can avoid extra copy of "c" to c_save before calling
GEMM. For very large sizes matrix initialization takes considerable amount of time. This can
be reduced now.
Change-Id: I2c6ffe169e991607314897cb0c1fbfc0d74ef179