[clang] [OpenMP] codegen support for masked combined construct masked taskloop simd (PR #121916)

[CHANDRA GHALE via cfe-commits]

chandraghale wrote:

@alexey-bataev  Can you approve this  and rest of splitted  PRs [121914](https://github.com/llvm/llvm-project/pull/121914)  and [121746](https://github.com/llvm/llvm-project/pull/121746 ) is the part of combined masked construct [PR-121741](https://github.com/llvm/llvm-project/pull/121741) already merged.  OpenMPSupport.rst and and rel note already updated. 

https://github.com/llvm/llvm-project/pull/121916