Xi Ge 8dda0193a6 ModuleInterface: lock .swiftinterface while generating module cache ...

This ensures only one process is generating module cache from an interface
file so that we don't blow up memory usage when multiple processes are
doing the same. The locking mechanism is similar to that of Clang's.

A better approach is that the build system takes care of the module building
step as a formal dependency.

rdar://52839445

2020-01-09 15:45:48 -08:00

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