[clang] [llvm] [CodeView] Flatten cmd args in frontend for LF_BUILDINFO (PR #106369)

[Alexandre Ganea via cfe-commits]

aganea wrote:

The code LG but I’d like please @nebulark if you can explain de unit tests changes? Why those offset changes? The code should emit the same thing as before?

https://github.com/llvm/llvm-project/pull/106369