[clang] [Clang][OpenMP] Fix crash on a `braced-init-list` in the `init` or increment of a transformed loop (PR #233248)

[Akash Manna via cfe-commits]

akash-manna-sky wrote:

@alexey-bataev, could you please take another look? is anything left to address? 

https://github.com/llvm/llvm-project/pull/233248