Use __is_polymorphic if available.  This fixes http://llvm.org/bugs/show_bug.cgi?id=11983 .  Patch contributed by Jonathan Sauer.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@150614 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed