add light filtering NEON intrinsics
add light filtering NEON intrinsics

disabled for now (but tested OK), thanks to the USE_INTRINSICS #define
We'll activate the code when we're on par with non-intrinsics

Change-Id: Idbfb9cb01f4c7c9f5131b270f8c11b70d0d485ff

yohunl/libwebp,altogother/webm.libwebp,kleopatra999/webm.libwebp,iniwf/webm.libwebp,ya7lelkom/libwebp,ttyangf/libwebp,reimaginemedia/webm.libwebp,zofuthan/libwebp,abwiz0086/webm.libwebp,abwiz0086/webm.libwebp,jacklicn/libwebp,iniwf/webm.libwebp,kleopatra999/webm.libwebp,Suvarna1488/webm.libwebp,keane83/BLE_IM,yohunl/libwebp,gshORTON/webm.libwebp,PKRoma/libwebp,iniwf/webm.libwebp,kleopatra999/webm.libwebp,kalli123/webm.libwebp,comoyo/gonzo-libwebp,altogother/webm.libwebp,Maria1099/webm.libwebp,PKRoma/libwebp,Aexyn/libwebp,imazen/libwebp,webmproject/libwebp,Acidburn0zzz/webm.libwebp,comoyo/gonzo-libwebp,ttyangf/libwebp,matanbs/webm.libwebp,ericmckean/webm.libwebp,rxl194/libwebp,zofuthan/libwebp,appunite/libwebp,jiehu5114/libwebp,matanbs/webm.libwebp,appunite/libwebp,jiehu5114/libwebp,Acidburn0zzz/webm.libwebp,Aexyn/libwebp,keane83/BLE_IM,comoyo/gonzo-libwebp,Suvarna1488/webm.libwebp,altogother/webm.libwebp,Maria1099/webm.libwebp,matanbs/webm.libwebp,Suvarna1488/webm.libwebp,kleopatra999/webm.libwebp,keane83/BLE_IM,Aexyn/libwebp,zofuthan/libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,appunite/libwebp,webmproject/libwebp,iniwf/webm.libwebp,redengineer/libwebp,reimaginemedia/webm.libwebp,yohunl/libwebp,yohunl/libwebp,kim42083/webm.libwebp,webmproject/libwebp,Maria1099/webm.libwebp,iniwf/webm.libwebp,ttyangf/libwebp,kim42083/webm.libwebp,rxl194/libwebp,kim42083/webm.libwebp,appunite/libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,Maria1099/webm.libwebp,keane83/BLE_IM,ericmckean/webm.libwebp,ya7lelkom/libwebp,Suvarna1488/webm.libwebp,imazen/libwebp,ttyangf/libwebp,gshORTON/webm.libwebp,kim42083/webm.libwebp,altogother/webm.libwebp,reimaginemedia/webm.libwebp,appunite/libwebp,PKRoma/libwebp,keane83/BLE_IM,jacklicn/libwebp,rxl194/libwebp,ericmckean/webm.libwebp,kalli123/webm.libwebp,redengineer/libwebp,kalli123/webm.libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,jiehu5114/libwebp,matanbs/webm.libwebp,appunite/libwebp,ericmckean/webm.libwebp,gshORTON/webm.libwebp,zofuthan/libwebp,jiehu5114/libwebp,ericmckean/webm.libwebp,webmproject/libwebp,comoyo/gonzo-libwebp,redengineer/libwebp,ttyangf/libwebp,jacklicn/libwebp,Maria1099/webm.libwebp,reimaginemedia/webm.libwebp,comoyo/gonzo-libwebp,imazen/libwebp,jiehu5114/libwebp,redengineer/libwebp,ya7lelkom/libwebp,ya7lelkom/libwebp,imazen/libwebp,jacklicn/libwebp,Acidburn0zzz/webm.libwebp,kim42083/webm.libwebp,Aexyn/libwebp,abwiz0086/webm.libwebp,ya7lelkom/libwebp,altogother/webm.libwebp,redengineer/libwebp,PKRoma/libwebp,Aexyn/libwebp,imazen/libwebp,Acidburn0zzz/webm.libwebp,PKRoma/libwebp,webmproject/libwebp,Acidburn0zzz/webm.libwebp,zofuthan/libwebp,reimaginemedia/webm.libwebp,gshORTON/webm.libwebp,PKRoma/libwebp,yohunl/libwebp,kalli123/webm.libwebp,Suvarna1488/webm.libwebp,matanbs/webm.libwebp,rxl194/libwebp,gshORTON/webm.libwebp,rxl194/libwebp,kalli123/webm.libwebp