[clang] [llvm] [clang][DependencyScanner] Remove unused -ivfsoverlay files (PR #73734)

[Ben Langmuir via cfe-commits]

https://github.com/benlangmuir commented:

It's odd to me that tracking is enabled by default.  I would have expected tracking be off by default and enabled explicitly for scanning. Similarly, in the modulemap case it could save-and-restore rather than enable the tracking if it was previously off.

https://github.com/llvm/llvm-project/pull/73734