PR4794: Make instantiating friend class decls not crash.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80272 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 42fc1f8..a79742b 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -265,6 +265,8 @@
   FriendClassDecl *NewD =
     FriendClassDecl::Create(SemaRef.Context, DC, D->getLocation(), T,
                             D->getFriendLoc());
+  NewD->setLexicalDeclContext(Owner);
+
   Owner->addDecl(NewD);
   return NewD;
 }