[PATCH] [libcxx] Fix detection of __is_final.

[Eric Fiselier]

Address @mclow.list's review comments. Default `__libcpp_is_final` to false when we don't have the intrinsics and remove the preprocessor blocks around its usage.


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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