Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC

F_{None,Text,Append} are kept for compatibility since r334221.

llvm-svn: 367800
diff --git a/llvm/tools/llvm-xray/xray-graph.cpp b/llvm/tools/llvm-xray/xray-graph.cpp
index c09357f..0be5112 100644
--- a/llvm/tools/llvm-xray/xray-graph.cpp
+++ b/llvm/tools/llvm-xray/xray-graph.cpp
@@ -506,7 +506,7 @@
   auto &GR = *GROrError;
 
   std::error_code EC;
-  raw_fd_ostream OS(GraphOutput, EC, sys::fs::OpenFlags::F_Text);
+  raw_fd_ostream OS(GraphOutput, EC, sys::fs::OpenFlags::OF_Text);
   if (EC)
     return make_error<StringError>(
         Twine("Cannot open file '") + GraphOutput + "' for writing.", EC);