[PATCH] [libcxxabi] Fix multi-level pointer conversions and pointer to member conversion detection.

[Eric Fiselier]

Hi mclow.lists, danalbert, compnerd,

Currently there are bugs in out detection of multi-level pointer conversions and pointer to member conversions. This patch fixes the following issues.

* Allow multi-level pointers with different nested qualifiers.
* Allow multi-level mixed pointers to objects and pointers to members with different nested qualifiers.
* Allow conversions from `int Base::*` to `int Derived::*` but only for non-nested pointers.

There is still some work that needs to be done to clean this patch up but I want to get some input on it.
Open questions:

* Does `__pointer_to_member_type_info::can_catch(...)` need to adjust the pointer if a base to derived conversion is performed?

http://reviews.llvm.org/D8758

Files:
  src/private_typeinfo.cpp
  src/private_typeinfo.h
  test/catch_member_data_pointer_01.pass.cpp
  test/catch_pointer_nullptr.pass.cpp

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