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Simplify shadow node fragment placeholders (#39239)
Summary: Pull Request resolved: #39239 We can avoid static guards and heap allocation memory by forcing a default initialized shared_ptr (which is constexpr), and telling the compiler to not bother with registering a destructor, as these shared_ptr will never hold a value. Changelog: [Internal] Reviewed By: rshest Differential Revision: D48867013 fbshipit-source-id: c31f535bb19382878c9f21d7145188bd91b63265
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