I'm not aware of a default key in Xcode to do this, but I've reprogrammed several keys to make my life easier.
There's a great post on this subject here:
Mac OS X Key Bindings - Erasetotheleft
One of their examples covers your exact requirement...
...
"~u" = "uppercaseWord:"; /* M-u */
"~l" = "lowercaseWord:"; /* M-l */
...
If you only want the definition to apply to Xcode, you need to modify (create if it doesn't exist):
~/Library/KeyBindings/PBKeyBinding.dict
There are good discussions of this here:
TypeOneError Studios™ Custom Key Bindings in XCode for TextMate users
and here:
Delete Line hot-key - Stack Overflow
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