I'm not sure that it does. In fact the Mountain Lion upgrade deleted the command line toolchain from my machine. I had to go into Xcode and manually tell it to re-download the "Command Line Tools" optional extension.
That's just the stuff that goes in /usr/bin, right? Aren't the files always present in /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin etc.?