<rdar://problem/12890171>

Providing a compact display mode for "po" to use where the convenience variable name and the pointer value are both hidden.
This is for convenience when dealing with ObjC instances where the description often gets it right and the debugger-provided information is not useful to most people.
If you need either of these, "expr" will still show them.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173748 91177308-0d34-0410-b5e6-96231b3b80d8