Florian Hahn 3a59628f3c Revert "[DSE] Switch to MemorySSA-backed DSE by default."
This reverts commit fb109c42d91c30c8c7497ef1fd7aff6f2969c6e7.

Temporarily revert due to a mis-compile pointed out at D87163.
2020-09-15 18:07:56 +01:00
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