[Stable] remove layout modification from stochastic swap #2507
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* remove layout modification from stochastic swap * remove first-layer optimization * update tests
mtreinish
approved these changes
May 28, 2019
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Summary
Fixes #1723
Stochastic swap was modifying the layout provided to it in certain circumstances, which led to unpredictable behavior.
Backport of #2463 to stable