rjmccall added inline comments.

================
Comment at: lib/CodeGen/CGObjCMac.cpp:6788
+         "emitting protocol metadata without definition");
+  PD = PD->getDefinition();
 
----------------
What happens in the `@implementation` case (the one that we're not diagnosing 
yet) when the protocol is a forward declaration?


Repository:
  rC Clang

https://reviews.llvm.org/D49462



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