Cut DestructorGuard default ctor
Summary: [Folly] Cut `DestructorGuard` default ctor. It does not actually need one, but its presence can hurt. ```lang=c++ void callback() { // compiles, which can hurt: DestructorGuard(delayed); // intended: DestructorGuard guard(delayed); } ``` Reviewed By: lbrandy Differential Revision: D10413329 fbshipit-source-id: f84eb0de0290cb09f7ac358044c2ef2d71dd8cea
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