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[DAGCombiner] Rewrite ImproveLifetimeNodeChain to avoid DAG loop.

Description

[DAGCombiner] Rewrite ImproveLifetimeNodeChain to avoid DAG loop.

Avoid EXPENSIVE_CHECK failure. NFCI.

Details

Committed
niravdMar 29 2019, 1:26 PM
Parents
rL357308: [LLD][COFF] Generate import modules & COFF groups in PDB
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