Rintaro Ishizaki d3d30ee246 [Serialization] Support Swift only system module ...

Previously 'isSystemModule()' returns true only if the module is:
- Standard library
- Clang module and that is `IsSystem`
- Swift overlay for clang `IsSystem` module

Now:
- Clang module and that is `IsSystem`; or
- Swift overlay for clang `IsSystem` module
- Swift module found in either of these directories:
  - Runtime library directoris (including stdlib)
  - Frameworks in `-Fsystem` directories
  - Frameworks in `$SDKROOT/System/Library/Frameworks/` (Darwin)
  - Frameworks in `$SDKROOT/Library/Frameworks/` (Darwin)

rdar://problem/50516314

2019-05-08 17:03:06 -07:00

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