[x86-64] Make even UNW_LOCAL_ONLY accessors go through validation.
[x86-64] Make even UNW_LOCAL_ONLY accessors go through validation.

Signed-off-by: Arun Sharma <deb3e242b5caa11d7d2432d7f9986958b57c2b2a@google.com>

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