Let SingletonHolder impl be class member type
Summary: [Folly] Let `SingletonHolder` impl be class member type v.s. function local type, which for arbitrary magical reasons improves rtti/debuginfo letting the debugger see the type exactly. Could also be done by extracting `SingletonHolderImpl` as a top-level type, but that would require an additional `friend` declaration and class member type works. Reviewed By: pixelb Differential Revision: D13333184 fbshipit-source-id: 7de4f8c16706acb18c6869b5dcd0b9c6952efc46
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