Temporarily revert to old switch map removal logic
Temporarily revert to old switch map removal logic

Summary: Switch off the new `OptimizeEnumsUnmap` logic to investigate the nondeterminism issue.

Reviewed By: ssj933

Differential Revision: D41200163

fbshipit-source-id: c8f7ff038abbae799c95f3a84cacb6ede09328bb

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