[PATCH] [libcxx] Fix use of operator comma where the types can be user defined

[Eric Fiselier]

Hi mclow.lists, danalbert,

An evil user might overload operator comma. Use a void cast to make sure any user overload is not selected.
Modify all the test iterators to define operator comma.

http://reviews.llvm.org/D5929

Files:
  include/algorithm
  include/deque
  include/forward_list
  include/locale
  include/numeric
  include/string
  include/utility
  test/containers/sequences/forwardlist/forwardlist.cons/assign_range.pass.cpp
  test/support/test_iterators.h
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