allocator: fixes regression: get alignment right for small objects
allocator: fixes regression: get alignment right for small objects

tulayang/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,dom96/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,russpowers/Nim,russpowers/Nim,tulayang/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,tulayang/Nim,russpowers/Nim,tulayang/Nim