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[FunctionAttrs] Remove old "returned" argument deduction
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Authored by jdoerfert on Mar 28 2019, 12:08 AM.



This removes the old FunctionAttrs "returned" argument deduction.

The code is obsolete as the Attributor deduction is more powerful.

The test cases that were affected by the change now run both passes.

No impact on the statistics (-stats) for LLVM-TS + Spec2006, this code is made obsolete by D59919.