Richard Wei 8e19cea55d Prepare to enable string processing by default. ...

This is some groundwork to make it possible to flip the `-enable-experimental-string-processing` flag on by default if and when it passes Swift Evolution. This PR itself do **not** change the defaults.

- Do not implicitly import _StringProcessing when building a module interface.
- Do not implicitly import _StringProcessing when core libraries, same as _Concurrency.

2022-04-22 15:46:06 -07:00

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