Fix StaticSingletonManager::create_<true>

Summary: [Folly] Fix `StaticSingletonManager::create_<true>` which is missing the `noexcept` specification.

Reviewed By: Mizuchi, xavierd

Differential Revision: D23552042

fbshipit-source-id: 629ad215602125a3e6322b36948df78c62fbef15

folly/detail/StaticSingletonManager.cpp

@@ -67,7 +67,7 @@ void* StaticSingletonManagerWithRtti::create_(Arg& arg) noexcept(Noexcept) {
 }
 
 template void* StaticSingletonManagerWithRtti::create_<false>(Arg& arg);
-template void* StaticSingletonManagerWithRtti::create_<true>(Arg& arg);
+template void* StaticSingletonManagerWithRtti::create_<true>(Arg& arg) noexcept;
 
 } // namespace detail
 } // namespace folly