Arnold Schwaighofer d87e617048 Teach the backend to make references to swift_async_extendedFramePointerFlags weak if it emits it ...

When references to the symbol `swift_async_extendedFramePointerFlags`
are emitted they have to be weak.

References to the symbol `swift_async_extendedFramePointerFlags` get
emitted only by frame lowering code. Therefore, the backend needs to track
references to the symbol and mark them weak.

Differential Revision: https://reviews.llvm.org/D115672

2021-12-15 10:02:06 -08:00

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