Add [[__gnu__::__returns_nonnull__]] attribute to allocation function… #1246
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…s for improved nullability guarantees
…ng AddressSanitizer
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…s for improved nullability guarantees
reallocate_n等几个函数可能传 n = 0 导致的错误进行修改，在 p!=nullptr 的情况下都会 deallocate(oldn)