[driver][macOS] Pick the system version for the deployment target
if the SDK is newer than the system
This commit improves the driver by making sure that it picks the system version
for the deployment target when the version of the macOS SDK is newer than the
system version.
rdar://29449467
Differential Revision: https://reviews.llvm.org/D34175
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@305678 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit cf092e8c65bbd3abcf4f254e2ad54db83d9eaeb7)
2 files changed
