[llvm-branch-commits] [llvm] gn build: Add check-builtins target. (PR #134482)

[Arthur Eubanks via llvm-branch-commits]

https://github.com/aeubanks approved this pull request.

wow this is very messy, feels like there should be a better way to do this on the CMake side

https://github.com/llvm/llvm-project/pull/134482