Remove the now unused sfi-<arch> modes. Tested with
Remove the now unused sfi-<arch> modes.
Tested with

rm -rf scons-out
./tools/llvm/utman.sh clean
./tools/llvm/utman.sh all
./tools/llvm/utman.sh test-all

Review URL: http://codereview.chromium.org/2825044

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@2701 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client