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Revert LIS handling in MachineDCE

Authored by rampitec on Apr 9 2019, 9:13 AM.

Description

Revert LIS handling in MachineDCE

One of out of tree targets has regressed with this patch. Reverting
it for now and let liveness to be fully reconstructed in case pass
was used after the LIS is created to resolve the regression.

Differential Revision: https://reviews.llvm.org/D60466

llvm-svn: 358015

Details