[clang] Switch builtin strings to use string tables (PR #118734)

[Chandler Carruth via cfe-commits]

chandlerc wrote:

The arm64-windows failures are from `DirectoryWatcherTest` that seems exceedingly unlikely to be related.

I think the only real failures here are the originally discussed ones on the one windows build bot. All the other windows bots seems to be OK here.

https://github.com/llvm/llvm-project/pull/118734