[OpenMP] Remove deprecated taskq

Remove very old, unused, and deprecated taskq code.

Patch by Terry Wilmarth

Differential Revision: https://reviews.llvm.org/D58989


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@356288 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed