[PATCH] [libcxx] Fix detection of __is_final.

[Eric Fiselier]

Hi mclow.lists, danalbert,

Currently we only enable the use of __is_final(...) with Clang. GCC also provides __is_final(...) since 4.7 in all standard modes. This patch creates the macro _LIBCPP_HAS_IS_FINAL to note the availability of `__is_final`.

http://reviews.llvm.org/D8795

Files:
  include/__config
  include/exception
  include/ext/hash_map
  include/map
  include/memory
  include/tuple
  include/type_traits
  include/unordered_map

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