[SILGen] Switch @_extern(c) over to a foreign entrypoint
#84974
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Rather than treating `@_extern(c)` functions like a Swift function with a C calling convention, treat them as foreign entrypoints, which better matches how we handle imported C functions.
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This ensures that when we reference them, we get an appropriately-typed function value. SILGen can then thunk to whatever function type is needed.
DougGregor
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hborla,
kavon,
slavapestov and
xedin
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Rather than treating
@_extern(c)functions like a Swift function with a C calling convention, treat them as foreign entrypoints, which better matches how we handle imported C functions.