COMPMID-830 Fix hang in arm_compute_benchmark NEON

Problem seems to happen when calling clfinish inside the CLScheduler
destructor. Removed destructor and now calling sync() in benchmarks
main.cpp.

Change-Id: Ibb36a0d19aa03349d291407a1fb8266dce3ec75b
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/116288
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
3 files changed