[clang][modules] Only avoid pruning module maps when asked to (#89428)
Pruning non-affecting module maps is useful even when passing module
maps explicitly via `-fmodule-map-file=<path>`. For this situation, this
patch reinstates the behavior we had prior to #87849. For the situation
where the explicit module map file arguments were generated by the
dependency scanner (which already pruned the non-affecting ones), this
patch introduces new `-cc1` flag
`-fno-modules-prune-non-affecting-module-map-files` that avoids the
extra work.
GitOrigin-RevId: 3ea5dff0efdbb4bf5590d882810aa42f9ec26e4e
7 files changed
