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[GlobalOpt] Pass DTU to removeUnreachableBlocks instead of recomputing.

Authored by fhahn on Oct 1 2019, 2:11 PM.



removeUnreachableBlocks knows how to preserve the DomTree, so make use
of it instead of re-computing the DT.

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fhahn created this revision.Oct 1 2019, 2:11 PM
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davide accepted this revision.Oct 1 2019, 2:17 PM

I think I wrote some of this code and it predates Kuba's incremental dominator updater. I'm fine, but I'll wait if he has opinions cc: @kuhar

This revision is now accepted and ready to land.Oct 1 2019, 2:17 PM
kuhar accepted this revision.Oct 1 2019, 2:18 PM

Looks good to me.

This revision was automatically updated to reflect the committed changes.