[libcxx-commits] [libcxx] [llvm] [libc++][CI] Upgrade compiler HEAD version to Clang-20 (PR #108761)

[Louis Dionne via libcxx-commits]

ldionne wrote:

I'd like to land https://github.com/llvm/llvm-project/pull/110303 before we tackle any kind of upgrade. That PR will make it a lot easier (and safer) to deploy a new image onto the bots.

https://github.com/llvm/llvm-project/pull/108761