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[CodeGen][ObjC] Emit the retainRV marker as a module flag instead of

Description

[CodeGen][ObjC] Emit the retainRV marker as a module flag instead of
named metadata.

This fixes 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/D60302