[driver] Don't try to set the deployment target when there is no bound
architecture; this was happening for tools such as lipo and dsymutil.
Also, if no -arch option has been specified, set the architecture based
on the TC default.
rdar://11329656


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155730 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed