<rdar://problem/12857181>

When a user says

type formatter add ... unsigned int

he most probably means to deal with the "unsigned int" type. However, given how the LLDB command parser works, that command will try to add the formatter to the TWO types 'unsigned' AND 'int'

Since this is unlikely to be what the user wants, warn about it, and suggest they can use quotes to override the debugger's understanding

llvm-svn: 200996