Fix tests on Windows.
Fix tests on Windows.

This wasn't actually a problem with the reformat, but rather a
problem with Visual Studio 2015 Update 3, which uses some c++14
features in its standard libraries.  So we had to change -std=c++11
to -std=c++14.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@280759 91177308-0d34-0410-b5e6-96231b3b80d8

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