[PATCH] Fix for libc++ bug #20096 http://llvm.org/bugs/show_bug.cgi?id=20096

[Marshall Clow]

The existing implementation of is_destructible assumes that if a class is abstract, then it is not destructible. Apparently, the fact that you can't construct one of these objects doesn't mean that you can't destruct them.

http://reviews.llvm.org/D4306

Files:
  include/type_traits
  test/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp
  test/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp
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