[clang] [llvm] [openmp] [CLANG][OpenMP] Restore loop variable values after transformation directives (PR #214717)

[Zahira Ammarguellat via llvm-commits]

zahiraam wrote:

> Shall do the same for unroll and split directives?

Split was fixed. Unroll already worked correctly, no changes needed.
See https://godbolt.org/z/GWWx447Wz and https://godbolt.org/z/KePGj4K1W.


https://github.com/llvm/llvm-project/pull/214717