[OpenMP] Fix Slice Duplicate in Profiler

Using LIBOMPTARGET_PROFILER, duplicates are created from timing both Kernel functions and Data update functions.
I commented out the duplicate timescope and left them in the targetkernel and the targetdataupdate functions. This
way the timescope calls will be closer to the launching of the kernel and the data moving.

Reviewed By: jdoerfert, tianshilei1992

Differential Revision: https://reviews.llvm.org/D157725