[clang] [clang][OpenMP] Use the emitted form of teams loop / target teams loop, not the AST kind (PR #233539)

[Robert Imschweiler via cfe-commits]

ro-i wrote:

just seeing this PR. I recently (~3w ago) also noticed this issue and created https://github.com/llvm/llvm-project/pull/228230. I guess that's now not needed anymore :)
Although I wonder: am I seeing this correctly that you're transforming loop to distribute rather early? Did you check if there are consumers of loop left that are now unreachable?

https://github.com/llvm/llvm-project/pull/233539