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

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nebulark wrote:

Applied the suggested changes. I also made MCTargetOptions::Argv0 a std::string. This is more consistent with the rest and makes usage for other frontends (e.g. rustc) easier and removes the need for the null check.
It's better for cl and cmd in LF_BUILDINFO to always be set, as this has caused issues with some pdb tools. Even if those are just an empty string.

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