let SingletonVault::type_ be atomic
Summary: It is possible to have concurrent calls to `SingletonVault::setType` and `SingletonHolder::createInstance`. In which cases, non-atomic accesses to `SingletonVault::type_` race. Differential Revision: D27904167 fbshipit-source-id: be01ee375d37839629b2e1d64bec99e32cd7e213
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