[clang] [Tooling] Fix misleading progress report when files have multiple compile commands (PR #169640)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

The changes seem pretty reasonable but there's a fair amount of unrelated formatting changes. It'd be easier on reviewers to back those unrelated changes out so we can more easily see just what's been materially modified.

https://github.com/llvm/llvm-project/pull/169640