[PATCH] [libcxx] Add <experimental/type_traits> for LFTS

[Eric Fiselier]

I moved the `__has_feature(variable_templates)` endif to before the invocation traits.

http://reviews.llvm.org/D5742

Files:
  include/experimental/type_traits
  test/experimental/utilities/meta/meta.type.synop/includes.pass.cpp
  test/experimental/utilities/meta/meta.type.synop/meta.rel.pass.cpp
  test/experimental/utilities/meta/meta.type.synop/meta.unary.cat.pass.cpp
  test/experimental/utilities/meta/meta.type.synop/meta.unary.comp.pass.cpp
  test/experimental/utilities/meta/meta.type.synop/meta.unary.prop.pass.cpp
  test/experimental/utilities/meta/meta.type.synop/meta.unary.prop.query.pass.cpp
  test/experimental/utilities/meta/version.pass.cpp
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