Make sure versions are valid before we try to use them. Also check for invalid versions[0] by comparing it to UINT32_MAX instead of 0.
Make sure versions are valid before we try to use them. Also check for invalid versions[0] by comparing it to UINT32_MAX instead of 0.



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@235892 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb