[PATCH] [libcxx] Attempt to fix undefined behavior in list, forward_list and __tree.

[Eric Fiselier]

Hi mclow.lists, rsmith, sam.saariste,

I'm not 100% confident in this patch yet but because of the time crunch with the 3.6 release I'm posting it early.

The patch works by using `static_cast` on fancy class-like pointers and `reinterpret_cast` on raw pointers. It also changes it so that when the base node class is needed at a call site then it gets the base pointer directly instead of the derived pointer.

I'll do more work on this and actually convince myself of its correctness.

http://reviews.llvm.org/D6974

Files:
  include/__tree
  include/forward_list
  include/list
  include/memory

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