[llvm] [NFC][cxxabi] Apply `cp-to-llvm.sh` (PR #101970)

[Louis Dionne via llvm-commits]

ldionne wrote:

We could / should have a CI step that checks that these files are synchronized. This happens often enough.

Even better would be to avoid the duplication, but unless we want to invest more engineering into making that work, we could at least catch it with CI.

https://github.com/llvm/llvm-project/pull/101970