gapil encoder: Un-inline write_zigzag
gapil encoder: Un-inline write_zigzag

It's used everywhere and produces masses of code.

baldwinn860/gapid,Qining/gapid,google/gapid,google/gapid,google/agi,Qining/gapid,baldwinn860/gapid,google/agi,google/gapid,Qining/gapid,baldwinn860/gapid,google/gapid,google/agi,pmuetschard/gapid,google/gapid,Qining/gapid,google/agi,baldwinn860/gapid,google/gapid,pmuetschard/gapid,pmuetschard/gapid,Qining/gapid,baldwinn860/gapid,pmuetschard/gapid,pmuetschard/gapid,pmuetschard/gapid,pmuetschard/gapid,Qining/gapid,google/gapid,Qining/gapid,google/agi,google/gapid,baldwinn860/gapid,pmuetschard/gapid,google/agi,baldwinn860/gapid,google/agi,google/agi,baldwinn860/gapid,Qining/gapid