Allow write-access to UNW_IA64_BSP and UNW_REG_SP.
Allow write-access to UNW_IA64_BSP and UNW_REG_SP.

(Logical change 1.303)

Keno/libunwind,zeldin/platform_external_libunwind,tronical/libunwind,lat/libunwind,bo-on-software/libunwind,pathscale/libunwind,DroidSim/platform_external_libunwind,androidarmv6/android_external_libunwind,lat/libunwind,zliu2014/libunwind-tilegx,lat/libunwind,joyent/libunwind,ehsan/libunwind,geekboxzone/lollipop_external_libunwind,jrmuizel/libunwind,vegard/libunwind,dropbox/libunwind,wdv4758h/libunwind,krytarowski/libunwind,cloudius-systems/libunwind,dreal-deps/libunwind,tkelman/libunwind,Keno/libunwind,yuyichao/libunwind,igprof/libunwind,krytarowski/libunwind,dreal-deps/libunwind,project-zerus/libunwind,wdv4758h/libunwind,adsharma/libunwind,rantala/libunwind,vtjnash/libunwind,zliu2014/libunwind-tilegx,fillexen/libunwind,cms-externals/libunwind,olibc/libunwind,unkadoug/libunwind,SyndicateRogue/libunwind,DroidSim/platform_external_libunwind,cms-externals/libunwind,maltek/platform_external_libunwind,dagar/libunwind,fdoray/libunwind,android-ia/platform_external_libunwind,unkadoug/libunwind,libunwind/libunwind,libunwind/libunwind,mpercy/libunwind,bo-on-software/libunwind,dagar/libunwind,tkelman/libunwind,atanasyan/libunwind,dagar/libunwind,bo-on-software/libunwind,atanasyan/libunwind-android,tronical/libunwind,androidarmv6/android_external_libunwind,krytarowski/libunwind,DroidSim/platform_external_libunwind,cloudius-systems/libunwind,evaautomation/libunwind,SyndicateRogue/libunwind,djwatson/libunwind,zeldin/platform_external_libunwind,jrmuizel/libunwind,CyanogenMod/android_external_libunwind,vtjnash/libunwind,atanasyan/libunwind-android,android-ia/platform_external_libunwind,rantala/libunwind,tony/libunwind,geekboxzone/lollipop_external_libunwind,martyone/libunwind,vegard/libunwind,frida/libunwind,cloudius-systems/libunwind,rogwfu/libunwind,rntz/libunwind,android-ia/platform_external_libunwind,0xlab/0xdroid-external_libunwind,rantala/libunwind,pathscale/libunwind,olibc/libunwind,dropbox/libunwind,rntz/libunwind,pathscale/libunwind,tony/libunwind,vegard/libunwind,tronical/libunwind,jrmuizel/libunwind,fillexen/libunwind,evaautomation/libunwind,rogwfu/libunwind,CyanogenMod/android_external_libunwind,geekboxzone/mmallow_external_libunwind,project-zerus/libunwind,igprof/libunwind,rogwfu/libunwind,evaautomation/libunwind,libunwind/libunwind,project-zerus/libunwind,maltek/platform_external_libunwind,djwatson/libunwind,atanasyan/libunwind-android,atanasyan/libunwind,wdv4758h/libunwind,tony/libunwind,fillexen/libunwind,Chilledheart/libunwind,olibc/libunwind,adsharma/libunwind,ehsan/libunwind,martyone/libunwind,yuyichao/libunwind,cms-externals/libunwind,CyanogenMod/android_external_libunwind,joyent/libunwind,frida/libunwind,unkadoug/libunwind,mpercy/libunwind,mpercy/libunwind,joyent/libunwind,Keno/libunwind,0xlab/0xdroid-external_libunwind,yuyichao/libunwind,fdoray/libunwind,geekboxzone/lollipop_external_libunwind,vtjnash/libunwind,tkelman/libunwind,atanasyan/libunwind,0xlab/0xdroid-external_libunwind,rntz/libunwind,zeldin/platform_external_libunwind,ehsan/libunwind,adsharma/libunwind,igprof/libunwind,frida/libunwind,SyndicateRogue/libunwind,dropbox/libunwind,martyone/libunwind,geekboxzone/mmallow_external_libunwind,maltek/platform_external_libunwind,androidarmv6/android_external_libunwind,fdoray/libunwind,Chilledheart/libunwind,Chilledheart/libunwind,geekboxzone/mmallow_external_libunwind,zliu2014/libunwind-tilegx,dreal-deps/libunwind,djwatson/libunwind