[clang] [Clang][Sema][OpenMP] Allow `num_teams` to accept multiple expressions (PR #99732)

[Shilei Tian via cfe-commits]

shiltian wrote:

> Update OpenMPSupport.rst and include info about changes to release notes

This is not part of OpenMP standard so I don't think we need to update `OpenMPSupport.rst`.

https://github.com/llvm/llvm-project/pull/99732