Fix a regression of the profiler introduced in commit fa273132e52dd9f9ecabc63117db73acbeead254
Fix a regression of the profiler introduced in commit
fa273132e52dd9f9ecabc63117db73acbeead254

A linter had wrongly suggested that a 'static int' local variable
was unused... it was a bit more subtle than that, see comment.

google/gemmlowp,google/gemmlowp,google/gemmlowp,google/gemmlowp