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

[via cfe-commits]

dyung wrote:

> > > Not sure what to do debug this... @zmodem maybe has some idea?
> > 
> > 
> > Sorry, I don't have a lot to add. Things look good on my end so far (local builds and https://lab.llvm.org/buildbot/#/builders/63 + https://lab.llvm.org/buildbot/#/builders/107).
> > Besides the particular MSVC version on the failing bot, it's also using ccache. Perhaps that could be related somehow?
> > @dyung would it be possible to extract `tools\clang\lib\Basic\CMakeFiles\obj.clangBasic.dir\Builtins.cpp.obj` from one of the failing builds?
> 
> Hmm... maybe it is ccache. Let me try doing a build with an empty cache and see if it still fails, otherwise, I'll extract that file.

A clean build with an empty ccache does not seem to have made a difference. :(

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

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