Fix 32bit-system integer overflow (test only)
Fix 32bit-system integer overflow (test only)

For #277
jbrads/flatbuffers,MiCHiLU/flatbuffers,endorph-soft/flatbuffers,royalharsh/flatbuffers,royalharsh/flatbuffers,kiyoto-suzuki/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,Reimerei/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,iperry/flatbuffers,rw/flatbuffers,rw/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,eburkitt/flatbuffers,MiCHiLU/flatbuffers,evolutional/flatbuffers,splhack/flatbuffers,endorph-soft/flatbuffers,jbrads/flatbuffers,jasonstubbs/flatbuffers,zarianw/flatbuffers,MiCHiLU/flatbuffers,wheelcomplex/flatbuffers,EricLagergren/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,zarianw/flatbuffers,SinbadFreedom/FlatBuffer,kiyoto-suzuki/flatbuffers,stewartmiles/flatbuffers,iperry/flatbuffers,stewartmiles/flatbuffers,endorph-soft/flatbuffers,jekinchen/flatjni,alexames/flatbuffers,evanw/flatbuffers,zarianw/flatbuffers,endorph-soft/flatbuffers,chobie/flatbuffers,rw/flatbuffers,evanw/flatbuffers,zarianw/flatbuffers,Reimerei/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,stewartmiles/flatbuffers,splhack/flatbuffers,google/flatbuffers,endorph-soft/flatbuffers,eburkitt/flatbuffers,benssson/flatbuffers,eburkitt/flatbuffers,FrankStain/flatbuffers,google/flatbuffers,pjulien/flatbuffers,chenkai036/flatbuffers,rw/flatbuffers,bog-dan-ro/flatbuffers,stewartmiles/flatbuffers,hgl888/flatbuffers,alexames/flatbuffers,layzerar/flatbuffers,kiyoto-suzuki/flatbuffers,MiCHiLU/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,eburkitt/flatbuffers,FrankStain/flatbuffers,jekinchen/flatjni,zarianw/flatbuffers,chenkai036/flatbuffers,pjulien/flatbuffers,bog-dan-ro/flatbuffers,alexames/flatbuffers,SinbadFreedom/FlatBuffer,chenkai036/flatbuffers,MiCHiLU/flatbuffers,benssson/flatbuffers,royalharsh/flatbuffers,SinbadFreedom/FlatBuffer,wheelcomplex/flatbuffers,fuchsia-mirror/third_party-flatbuffers,evanw/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,alexames/flatbuffers,evanw/flatbuffers,eburkitt/flatbuffers,wheelcomplex/flatbuffers,evanw/flatbuffers,vitalyisaev2/flatbuffers,chobie/flatbuffers,kadirahq/flatbuffers,layzerar/flatbuffers,splhack/flatbuffers,evolutional/flatbuffers,rw/flatbuffers,bog-dan-ro/flatbuffers,jasonstubbs/flatbuffers,EricLagergren/flatbuffers,eproxus/flatbuffers,jekinchen/flatjni,iperry/flatbuffers,splhack/flatbuffers,evolutional/flatbuffers,splhack/flatbuffers,DavadDi/flatbuffers,FrankStain/flatbuffers,benssson/flatbuffers,kiyoto-suzuki/flatbuffers,iperry/flatbuffers,EricLagergren/flatbuffers,EricLagergren/flatbuffers,Reimerei/flatbuffers,benssson/flatbuffers,MiCHiLU/flatbuffers,jekinchen/flatjni,jasonstubbs/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,FrankStain/flatbuffers,evanw/flatbuffers,layzerar/flatbuffers,alexames/flatbuffers,google/flatbuffers,eburkitt/flatbuffers,fuchsia-mirror/third_party-flatbuffers,jasonstubbs/flatbuffers,kiyoto-suzuki/flatbuffers,rw/flatbuffers,stewartmiles/flatbuffers,DavadDi/flatbuffers,evolutional/flatbuffers,fuchsia-mirror/third_party-flatbuffers,splhack/flatbuffers,pjulien/flatbuffers,evolutional/flatbuffers,jekinchen/flatjni,evolutional/flatbuffers,jekinchen/flatjni,iperry/flatbuffers,FrankStain/flatbuffers,wheelcomplex/flatbuffers,chenkai036/flatbuffers,jasonstubbs/flatbuffers,zarianw/flatbuffers,evolutional/flatbuffers,google/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,fuchsia-mirror/third_party-flatbuffers,eproxus/flatbuffers,google/flatbuffers,fuchsia-mirror/third_party-flatbuffers,benssson/flatbuffers,Reimerei/flatbuffers,jbrads/flatbuffers,alexames/flatbuffers,fuchsia-mirror/third_party-flatbuffers,jasonstubbs/flatbuffers,kadirahq/flatbuffers,vitalyisaev2/flatbuffers,eburkitt/flatbuffers,google/flatbuffers,vitalyisaev2/flatbuffers,FrankStain/flatbuffers,kiyoto-suzuki/flatbuffers,alexames/flatbuffers,chenkai036/flatbuffers,google/flatbuffers,hgl888/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,hgl888/flatbuffers,iperry/flatbuffers,MiCHiLU/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,endorph-soft/flatbuffers,SinbadFreedom/FlatBuffer,splhack/flatbuffers,evanw/flatbuffers,DavadDi/flatbuffers,FrankStain/flatbuffers,iperry/flatbuffers,endorph-soft/flatbuffers,hgl888/flatbuffers,layzerar/flatbuffers,layzerar/flatbuffers,jekinchen/flatjni,royalharsh/flatbuffers,zarianw/flatbuffers,bog-dan-ro/flatbuffers,SinbadFreedom/FlatBuffer,EricLagergren/flatbuffers,vitalyisaev2/flatbuffers,stewartmiles/flatbuffers,wheelcomplex/flatbuffers,wheelcomplex/flatbuffers,benssson/flatbuffers,SinbadFreedom/FlatBuffer,hgl888/flatbuffers,royalharsh/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,bog-dan-ro/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,kiyoto-suzuki/flatbuffers,pjulien/flatbuffers,eproxus/flatbuffers,jasonstubbs/flatbuffers,vitalyisaev2/flatbuffers,kadirahq/flatbuffers,fuchsia-mirror/third_party-flatbuffers,eburkitt/flatbuffers,zarianw/flatbuffers,benssson/flatbuffers,ro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