Add a wrapper for open.

This centralizes the handling of O_BINARY and opens the way for hiding more
differences (like how open behaves with directories).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186447 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
index 7616aa3..c7d14af 100644
--- a/tools/lto/LTOCodeGenerator.cpp
+++ b/tools/lto/LTOCodeGenerator.cpp
@@ -137,8 +137,7 @@
 
   // create output file
   std::string ErrInfo;
-  tool_output_file Out(path, ErrInfo,
-                       raw_fd_ostream::F_Binary);
+  tool_output_file Out(path, ErrInfo, sys::fs::F_Binary);
   if (!ErrInfo.empty()) {
     errMsg = "could not open bitcode file for writing: ";
     errMsg += path;