Fix FreeBSD build error in r287920
Fix FreeBSD build error in r287920

The conditional expression is ambiguous there, so help it by explicitly casting.
This will go away once we use chrono all the way down.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@287921 91177308-0d34-0410-b5e6-96231b3b80d8

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