Add a final fall-back to PlatformDarwin::GetDeveloperDirectory() which
will run xcode-select --print-path to find the currently selected 
Xcode developer directory.  Mostly useful for when lldb is not being run out
of the /Applications/Xcode.app bundle so it can't locate the iOS or
kernel SDKs.

llvm-svn: 180705
1 file changed