Remove old driver code to grab the iOS simulator version from the -D option.

We can now rely on the -mios-simulator-version-min command line option
and remove the awful hack. <rdar://problem/10304510>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167603 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed