Misc cleanups and be more consistent about passing mtriple.
Misc cleanups and be more consistent about passing mtriple.

Tested:
./tools/llvm/utman.sh clean
./tools/llvm/utman.sh all
./tools/llvm/utman.sh test-all
Review URL: http://codereview.chromium.org/3123001

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@2956 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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