[clang] [OpenMPIRBuilder] Remove wrapper function in `createTask`, `createTeams` (PR #67723)

[Kiran Chandramohan via cfe-commits]

https://github.com/kiranchandramohan commented:

Could you expand the summary to describe the changes.
What are the changes required to remove the wrapper function (Why was it required in the first place?)
Why are the fake vals necessary?


https://github.com/llvm/llvm-project/pull/67723