Add support for the __has_trivial_destructor type trait.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69345 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclCXX.cpp b/lib/AST/DeclCXX.cpp
index 78ed3fc..a5d133c 100644
--- a/lib/AST/DeclCXX.cpp
+++ b/lib/AST/DeclCXX.cpp
@@ -29,7 +29,7 @@
     UserDeclaredConstructor(false), UserDeclaredCopyConstructor(false),
     UserDeclaredCopyAssignment(false), UserDeclaredDestructor(false),
     Aggregate(true), PlainOldData(true), Polymorphic(false), Abstract(false),
-    HasTrivialConstructor(true),
+    HasTrivialConstructor(true), HasTrivialDestructor(true),
     Bases(0), NumBases(0), Conversions(DC, DeclarationName()),
     TemplateOrInstantiation() { }