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

[via cfe-commits]

zmodem 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?

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