David Farler 8ca30ff2d7 Ask SILFunction link entities' clang nodes for weakness when applicable ...

When importing C functions with availability attributes, we don't
properly use that information to decide whether a symbol should be
weak_extern, causing load failures in dylibs that reference these
symbols when deployed to an older OS.

This is a very targeted fix and we need a better architecture for
deciding this.

rdar://problem/26359452

2016-06-01 12:52:04 -07:00

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