Xi Ge 9988911232 Frontend: add a new action -scan-clang-dependencies to scan a PCM's dependencies ...

For the issue mentioned in rdar://67079780, swift-driver needs to run clang dependencies
scanner multiple times with different target triples for a Swift target. This patch adds
a new scanning action to generate the JSON file for a given clang module to accommodate
this requirement.

Resolves: rdar://problem/67269210

2020-08-17 22:02:32 -07:00

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