[clang] [clang][DependencyScanning] Move driver-command logic for by-name scanning into DependencyScanningTool (PR #171238)

[Jan Svoboda via cfe-commits]

https://github.com/jansvoboda11 commented:

I'll defer this PR to @qiongsiwu again, but I have a few small comments.

https://github.com/llvm/llvm-project/pull/171238