Gate `__returns_nonnull__` attribute to gcc 4.9 or later
Summary: The attribute `__returns_nonnull__` is only applicable for gcc 4.9 or later (https://gcc.gnu.org/onlinedocs/gcc-4.8.5/gcc/Function-Attributes.html#Function-Attributes) Reviewed By: ot Differential Revision: D3976598 fbshipit-source-id: 3c678a11c5046e5a8b7686327dbb3ebc9b598616
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