Implement some framework for defaulted constructors.

There's some unused stuff for now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130912 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 6e11ef5..6fa208f 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -1330,7 +1330,8 @@
                                         StartLoc, NameInfo, T, TInfo,
                                         Constructor->isExplicit(),
                                         Constructor->isInlineSpecified(),
-                                        false);
+                                        false,
+                                        Constructor->isExplicitlyDefaulted());
   } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
     Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
                                        StartLoc, NameInfo, T, TInfo,