implement VE4/HE4/RD4/... in SSE2
implement VE4/HE4/RD4/... in SSE2

(30% faster prediction functions, but overall speed-up is ~1% only)

Change-Id: I2c6e7074aa26a2359c9198a9015e5cbe143c2765

kim42083/webm.libwebp,yohunl/libwebp,gshORTON/webm.libwebp,altogother/webm.libwebp,imazen/libwebp,kim42083/webm.libwebp,kalli123/webm.libwebp,Aexyn/libwebp,Suvarna1488/webm.libwebp,Maria1099/webm.libwebp,kleopatra999/webm.libwebp,PKRoma/libwebp,ericmckean/webm.libwebp,kalli123/webm.libwebp,Suvarna1488/webm.libwebp,ttyangf/libwebp,yohunl/libwebp,matanbs/webm.libwebp,yohunl/libwebp,jiehu5114/libwebp,yohunl/libwebp,Acidburn0zzz/webm.libwebp,zofuthan/libwebp,gshORTON/webm.libwebp,kim42083/webm.libwebp,abwiz0086/webm.libwebp,altogother/webm.libwebp,comoyo/gonzo-libwebp,rxl194/libwebp,imazen/libwebp,ya7lelkom/libwebp,imazen/libwebp,PKRoma/libwebp,iniwf/webm.libwebp,yohunl/libwebp,PKRoma/libwebp,jiehu5114/libwebp,matanbs/webm.libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,redengineer/libwebp,reimaginemedia/webm.libwebp,Maria1099/webm.libwebp,rxl194/libwebp,matanbs/webm.libwebp,reimaginemedia/webm.libwebp,abwiz0086/webm.libwebp,ttyangf/libwebp,ya7lelkom/libwebp,jacklicn/libwebp,abwiz0086/webm.libwebp,gshORTON/webm.libwebp,iniwf/webm.libwebp,kalli123/webm.libwebp,jiehu5114/libwebp,Aexyn/libwebp,jacklicn/libwebp,Aexyn/libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,ericmckean/webm.libwebp,webmproject/libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,ttyangf/libwebp,ericmckean/webm.libwebp,imazen/libwebp,kleopatra999/webm.libwebp,Suvarna1488/webm.libwebp,rxl194/libwebp,zofuthan/libwebp,webmproject/libwebp,ya7lelkom/libwebp,Acidburn0zzz/webm.libwebp,reimaginemedia/webm.libwebp,PKRoma/libwebp,Aexyn/libwebp,altogother/webm.libwebp,ttyangf/libwebp,webmproject/libwebp,comoyo/gonzo-libwebp,ya7lelkom/libwebp,kim42083/webm.libwebp,altogother/webm.libwebp,comoyo/gonzo-libwebp,Suvarna1488/webm.libwebp,redengineer/libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,redengineer/libwebp,redengineer/libwebp,imazen/libwebp,ttyangf/libwebp,kalli123/webm.libwebp,matanbs/webm.libwebp,Acidburn0zzz/webm.libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,ya7lelkom/libwebp,Suvarna1488/webm.libwebp,Maria1099/webm.libwebp,PKRoma/libwebp,jacklicn/libwebp,Acidburn0zzz/webm.libwebp,iniwf/webm.libwebp,gshORTON/webm.libwebp,webmproject/libwebp,jiehu5114/libwebp,Maria1099/webm.libwebp,jacklicn/libwebp,rxl194/libwebp,Aexyn/libwebp,kleopatra999/webm.libwebp,jiehu5114/libwebp,webmproject/libwebp,PKRoma/libwebp,zofuthan/libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,ericmckean/webm.libwebp,zofuthan/libwebp,matanbs/webm.libwebp,Acidburn0zzz/webm.libwebp,reimaginemedia/webm.libwebp,Maria1099/webm.libwebp,iniwf/webm.libwebp,altogother/webm.libwebp,zofuthan/libwebp,ericmckean/webm.libwebp,kalli123/webm.libwebp,redengineer/libwebp,kleopatra999/webm.libwebp,rxl194/libwebp