Florian Hahn 20d798bd47 Recommit "[SCEV] Look through single value PHIs." (take 3) ...

This reverts commit 1fbdbb5595.

All known issues surfaced by this patch should have been fixed now.

The fixes included fixing issues with SCEV expansion in LV and DA's
reliance on LCSSA phis.

2022-06-09 15:20:10 +01:00

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