Force -Os for upb_def.o
Force -Os for upb_def.o

tempbottle/upb,tbetbetbe/upb,bsn069/upb,tempbottle/upb,tbetbetbe/upb,bsn069/upb,tempbottle/upb,tbetbetbe/upb,bsn069/upb,bsn069/upb,bsn069/upb,tempbottle/upb,tbetbetbe/upb,tbetbetbe/upb,tempbottle/upb