x86 JIT: add easy switch between replicated/common dispatch.
x86 JIT: add easy switch between replicated/common dispatch.

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