[clang] [clang][Modules] Handle relocated modules during implicit module builds (PR #181836)

[Jan Svoboda via cfe-commits]

https://github.com/jansvoboda11 commented:

Does the incremental scan benchmark actually relocate any modules? Can you give absolute numbers of your benchmarks? In the past, I mostly optimized for the clean scan case, because that's fairly slow, while the incremental scan is typically much faster. If that's still the case, I think the 4.7% regression in the incremental case is fine.

The intent here seems reasonable, I have just a couple of minor comments.

https://github.com/llvm/llvm-project/pull/181836