Florian Hahn f75564ad4e Reland "[SCEVExpander] Add option to preserve LCSSA directly." ...

This reverts the revert commit dc28675768.

It includes a fix for Polly, which uses SCEVExpander on IR that is not
in LCSSA form. Set PreserveLCSSA = false in that case, to ensure we do
not introduce LCSSA phis where there were none before.

2020-07-29 20:41:53 +01:00

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