Jordan Rose b3c5a68acf [Serialization] Reduce file size by splitting dep dirnames from basenames ...

Dependency tracking for cached compiled modules (compiled from
swiftinterfaces) can lead to a high percentage of the module being
SDK-relative paths when -track-system-dependencies is on. Cut down on
this by storing directory names in a separate record that gets
referenced from each file dependency. (Since a lot of per-file
dependencies are header files in a common directory, this is a win.)

We can do something more clever in the future, but this is a
reasonable start for, say, the overlays.

rdar://problem/50449802

2019-05-04 10:47:46 -07:00

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