fix heap allocators when shrinking an object but growing its alignment
fix heap allocators when shrinking an object but growing its alignment

zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig