msvc: add intrinsic based BitsLog2Floor
msvc: add intrinsic based BitsLog2Floor

Change-Id: Ic0c7d2f03e300c6699e130916a759403e672f9d8

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