Add some more tests for instantiation of declaration references. Also,
improve some error recovery with explicit template instantiation.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72484 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index c533789..97eca48 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -2369,6 +2369,9 @@
     return true;
   }
 
+  if (Tag->isInvalidDecl())
+    return true;
+
   CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
   CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
   if (!Pattern) {