store string values of args directly instead of in global datastore so that
store string values of args directly instead of in global datastore so that

looking up arg values is basically free

git-svn-id: 4403cc1077de9de61ebbb06aa07b0a825c555f62@3291 dc4e9af1-7f46-4ead-bba6-71afc04862de

blue42u/swift-t,swift-lang/swift-t,swift-lang/swift-t,blue42u/swift-t,basheersubei/swift-t,blue42u/swift-t,JohnPJenkins/swift-t,blue42u/swift-t,swift-lang/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t,basheersubei/swift-t,basheersubei/swift-t,basheersubei/swift-t,JohnPJenkins/swift-t,blue42u/swift-t,swift-lang/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t,basheersubei/swift-t,blue42u/swift-t,blue42u/swift-t,JohnPJenkins/swift-t,JohnPJenkins/swift-t,basheersubei/swift-t,basheersubei/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t