Alastair Houghton 44783e72c6 [Frontend] Add support for implicit import of _Backtracing ...

Once the API has gone through Swift Evolution, we will want to implicitly
import the _Backtracing module.  Add code to do that, but set it to off
by default for now.

rdar://105394140

2023-03-04 08:00:06 +00:00

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