Tries to grow the current allocation in-place. If that isn't possible, the allocator grows by as much as it is able to, and the new length of the allocation is returned. The new length is guaranteed to be in the range `old_size..=new_size`. # Safety `ptr` must point to a valid allocation of `old_size` blocks. Also, `new_size > old_size`.
(&self, ptr: NonNull<u8>, old_size: usize, new_size: usize)
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