Artem Chikin 67eca9b794 [DependencyScanner] Change the scanner order to resolve placeholders first. ...

This is meant to address a problem that arises on incremental package builds:

A re-scan on an already-built package instead of a placeholder dependency produces a graph that contains a dependency consisting solely of the previously-built swiftmodule.
This is not the behaviour we would like. Instead, we should respect that this is a placeholder dependency and ensure that the dependency graph for that dependency itself captures the fact that a previously-built module exists using compiledModuleCandidates field of the dependency graph.

2020-08-28 14:32:17 -07:00

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