Florian Hahn 7a1e73f0b9 Recommit "[VPlan] Add recipe for first-order rec phis, make splicing explicit." ...

This reverts the revert commit b1777b04dc.

The patch originally got reverted due to a crash:
https://bugs.chromium.org/p/chromium/issues/detail?id=1232798#c2

The underlying issue was that we were not using the stored values from
the modified memory recipes, but the out-of-date values directly from
the IR (accessed via the VPlan). This should be fixed in d995d6376. A
reduced version of the reproducer has been added in 93664503be.

2021-07-26 15:50:30 +01:00

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