Xi Ge 29e655bac0 DependenciesScanner: implement protocol for batch module dependencies scan ...

This scanning mode allows swift-driver to query module dependencies in a batch
and in a more granular way. In short term, it could help solve a problem that
clang module dependencies may vary if target triple changes. In a longer term,
we could break a holistic dependencies graph into smaller pieces for better caching
and reusing.

This change doesn't include the implementation of using the specified scanner
arguments to set up Clang dependencies scanner. It will come in later commits.

2020-08-20 14:06:47 -07:00

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