[clang] [llvm] [clang][ScanDeps] Allow PCHs to have different VFS overlays (PR #82294)

[Michael Spencer via llvm-commits]

Bigcheese wrote:

> Just to clarify, this patch doesn't attempt to solve the case where Clang can crash when the VFS overlay files are different between the PCH and the TU, since that's existing behavior. Correct?

Yep, this patch still allows that to happen in cases where it would today.

https://github.com/llvm/llvm-project/pull/82294