Emit an update record if we instantiate the definition of a function template
specialization from a module. (This can also happen for function template
specializations in PCHs if they're instantiated eagerly, because they're
constexpr or have a deduced return type.)

llvm-svn: 204547
diff --git a/clang/lib/Serialization/ASTCommon.h b/clang/lib/Serialization/ASTCommon.h
index 9f4d7a9..524a9c2 100644
--- a/clang/lib/Serialization/ASTCommon.h
+++ b/clang/lib/Serialization/ASTCommon.h
@@ -26,6 +26,7 @@
   UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION,
   UPD_CXX_ADDED_ANONYMOUS_NAMESPACE,
   UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER,
+  UPD_CXX_INSTANTIATED_FUNCTION_DEFINITION,
   UPD_CXX_RESOLVED_EXCEPTION_SPEC,
   UPD_CXX_DEDUCED_RETURN_TYPE,
   UPD_DECL_MARKED_USED,