[llvm-branch-commits] [OpenMP] Mostly remove experimental taskgraph support from runtime (PR #194046)

[Julian Brown via llvm-branch-commits]

https://github.com/jtb20 created https://github.com/llvm/llvm-project/pull/194046

Because the changes to runtime support for taskgraph record/replay
are quite extensive, they will likely be more comprehensible if the
existing parts are removed before the new parts are added.  This is the
removal part.

commit-id:ebbd0706