Jordan Rose f0c3bc25ff [IRGen] Don't emit ObjC class property metadata on old targets. (#2350) ...

The ObjC runtime on OS X 10.10 and older and iOS 9 and older can't
handle them, so for these targets, emit nil for all class property
lists.

It's a little unfortunate that this is target-dependent, but there's
not much we can do about it.

rdar://problem/25605427

2016-05-02 13:10:02 -07:00

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