cpu/cortexm_common: select bitarithm_lsb() by available instructions
cpu/cortexm_common: select bitarithm_lsb() by available instructions

jasonatran/RIOT,lazytech-org/RIOT,toonst/RIOT,rfuentess/RIOT,basilfx/RIOT,basilfx/RIOT,josephnoir/RIOT,basilfx/RIOT,kYc0o/RIOT,jasonatran/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,mtausig/RIOT,LudwigOrtmann/RIOT,OlegHahm/RIOT,yogo1212/RIOT,miri64/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,authmillenon/RIOT,kaspar030/RIOT,mfrey/RIOT,neiljay/RIOT,mtausig/RIOT,biboc/RIOT,ant9000/RIOT,OlegHahm/RIOT,kaspar030/RIOT,cladmi/RIOT,lazytech-org/RIOT,x3ro/RIOT,lazytech-org/RIOT,authmillenon/RIOT,gebart/RIOT,yogo1212/RIOT,LudwigOrtmann/RIOT,BytesGalore/RIOT,toonst/RIOT,aeneby/RIOT,mfrey/RIOT,RIOT-OS/RIOT,x3ro/RIOT,toonst/RIOT,kbumsik/RIOT,josephnoir/RIOT,x3ro/RIOT,LudwigKnuepfer/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,LudwigKnuepfer/RIOT,kaspar030/RIOT,A-Paul/RIOT,miri64/RIOT,miri64/RIOT,rfuentess/RIOT,cladmi/RIOT,BytesGalore/RIOT,kaspar030/RIOT,kbumsik/RIOT,A-Paul/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,smlng/RIOT,gebart/RIOT,kYc0o/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,LudwigOrtmann/RIOT,aeneby/RIOT,RIOT-OS/RIOT,gebart/RIOT,ant9000/RIOT,miri64/RIOT,basilfx/RIOT,kbumsik/RIOT,A-Paul/RIOT,mfrey/RIOT,neiljay/RIOT,mfrey/RIOT,toonst/RIOT,authmillenon/RIOT,avmelnikoff/RIOT,avmelnikoff/RIOT,mtausig/RIOT,neiljay/RIOT,LudwigKnuepfer/RIOT,OlegHahm/RIOT,aeneby/RIOT,rfuentess/RIOT,biboc/RIOT,kYc0o/RIOT,yogo1212/RIOT,yogo1212/RIOT,smlng/RIOT,x3ro/RIOT,neiljay/RIOT,kYc0o/RIOT,jasonatran/RIOT,aeneby/RIOT,gebart/RIOT,gebart/RIOT,cladmi/RIOT,josephnoir/RIOT,biboc/RIOT,authmillenon/RIOT,aeneby/RIOT,kaspar030/RIOT,avmelnikoff/RIOT,LudwigOrtmann/RIOT,ant9000/RIOT,yogo1212/RIOT,OTAkeys/RIOT,ant9000/RIOT,OlegHahm/RIOT,authmillenon/RIOT,lazytech-org/RIOT,smlng/RIOT,miri64/RIOT,BytesGalore/RIOT,yogo1212/RIOT,basilfx/RIOT,cladmi/RIOT,avmelnikoff/RIOT,BytesGalore/RIOT,biboc/RIOT,toonst/RIOT,smlng/RIOT,josephnoir/RIOT,rfuentess/RIOT,cladmi/RIOT,kbumsik/RIOT,kbumsik/RIOT,x3ro/RIOT,rfuentess/RIOT,mtausig/RIOT,kYc0o/RIOT,neiljay/RIOT,mfrey/RIOT,A-Paul/RIOT,josephnoir/RIOT,smlng/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,biboc/RIOT,BytesGalore/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,mtausig/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,A-Paul/RIOT