[OpenMP] Fix new task creation

Summary:
When OMPT is not supported the __kmp_omp_task() function is passed the parameters in the wrong order. This is a fix related to patch D47709.


Reviewers: Hahnfeld, sconvent, caomhin, jlpeyton

Reviewed By: Hahnfeld

Subscribers: guansong, openmp-commits

Differential Revision: https://reviews.llvm.org/D50001

llvm-svn: 338295