Add new swift.modular_indexing feature to index explicit PCMs #1331
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This allows us to index explicit PCMs once they are built and then
never again. Currently we only do this for system SDKs as we assume
that we already have source code available for other SDKs, but this
can be expanded in the future.
In addition, make swift.file_prefix_map also remap DEVELOPER_DIR.
PiperOrigin-RevId: 478594522
(cherry picked from commit a5d5c2b)
Only add "index-unit-output-path" in the output map for modular indexing
Pre Xcode 14 you'll get a warning if this is specified without having indexing enabled:
We can reconsider this in the future (e.g. to automatically set this for Xcode 14+),
but for now limit the scope based on the modular indexing feature.
PiperOrigin-RevId: 480943677
(cherry picked from commit c9b5002)