[Clang][OpenMP] Make copyin clause on combined and composite construct work...

[Clang][OpenMP] Make copyin clause on combined and composite construct work (patch by Yuichiro Utsumi (utsumi.yuichiro@fujitsu.com))

Make copyin clause on the following constructs work.

- parallel for
- parallel for simd
- parallel sections

Fixes https://github.com/llvm/llvm-project/issues/55547

Patch by Yuichiro Utsumi (utsumi.yuichiro@fujitsu.com)

Reviewed By: ABataev

Differential Revision: https://reviews.llvm.org/D132209