[clang] [clang][Tooling] Preserve -std flag when transferring compile commands across same-family language (PR #184560)

[Nathan Ridge via cfe-commits]

https://github.com/HighCommander4 approved this pull request.

Thanks for the patch! Looks good to me, just have one suggestion for an added scenario to cover in the test.

https://github.com/llvm/llvm-project/pull/184560