Graydon Hoare 3ef686bf92 [DeadFunctionElimination] Pass on keypaths to foreign DeclRef properties. ...

These show up specifically when someone forms a keypath to an ObjC
property in a category. They're no-ops from the perspective of
DFE but the code has to intentionally skip the case if it wants to
avoid the subsequent llvm_unreachable.

rdar://34913689

2017-10-25 23:21:56 -07:00

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