[PATCH] Add support for "fancy" pointers to shared_ptr. Fixes PR20616

[Eric Fiselier]

Implemented feedback from bug report. Use allocator traits to get the pointer type, not the allocator itself.

http://reviews.llvm.org/D4859

Files:
  include/memory
  test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
  test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
  test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
  test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_no_variadics.pass.cpp
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