[libcxx-commits] [libcxx] [libc++][C++03] Copy the LLVM 19 headers (PR #108999)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> This is one of those times where having 1000 headers makes things slightly trickier.

Actually the exact same issue would have happened if we had just a few headers, since they would have been moved to e.g. `__cxx03/vector` and the same issue would have been triggered. The real issue here IMO is the flakiness of our CI recently, which is probably what led Nikolas to ignore the CI failure before merging.

https://github.com/llvm/llvm-project/pull/108999