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Akira Hatanaka 5564068261 [ObjC][ARC] Convert the retainRV marker that is passed as a named
metadata into a module flag in the auto-upgrader and make the ARC
contract pass read the marker as a module flag.

This is needed to fix a bug where ARC contract wasn't inserting the
retainRV marker when LTO was enabled, which caused objects returned
from a function to be auto-released.

rdar://problem/49464214

Differential Revision: https://reviews.llvm.org/D60303

llvm-svn: 358047
2019-04-10 06:20:20 +00:00
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