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[MemorySSA] Remove optimized value when reseting optimized.

Authored by asbirlea on Jan 8 2019, 5:15 PM.



If we don't reset the optimized value O for access A, even though A is no longer optimized to O, A will still show up in that O's users list.
This fails verification when hoisting a Def outside a loop, even though the updates are correct.
The reason is that the phi in the loop header still find as user the hoisted def, because the Def has a pointer to the Phi in its optimized operand.

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asbirlea created this revision.Jan 8 2019, 5:15 PM
This revision is now accepted and ready to land.Jan 8 2019, 7:26 PM
This revision was automatically updated to reflect the committed changes.