Make llc and ld command lines use argz, and add new command line interfaces for use in the coordinator.
Make llc and ld command lines use argz, and add new command line interfaces
for use in the coordinator.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2440
TEST=none
Review URL: http://codereview.chromium.org/8763005

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7309 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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