[llvm] [OpenMPIRBuilder] Added `createTeams` (PR #65785)

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shraiysh wrote:

It is based on the task construct. This also has an intermediate wrapper function - it is inlined at the end though (I can remove it if there's a reason to. I just chose it this way to avoid the extra function. I do not know about the terminators. I will try to look for his comments on the patch for task.

https://github.com/llvm/llvm-project/pull/65785