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

[via cfe-commits]

zmodem wrote:

> I've pulled out the entire tools\clang\lib\Basic directory from a failing build, what would you like me to do with it?

Can you put it in a zip somewhere? It would be interesting to check if there's some major difference compared to using a different MSVC version.

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