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/lib/Target/TargetMachineC.cpp b/lib/Target/TargetMachineC.cpp
index 01d12e8..7419122 100644
--- a/lib/Target/TargetMachineC.cpp
+++ b/lib/Target/TargetMachineC.cpp
@@ -200,7 +200,7 @@
 LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
   char* Filename, LLVMCodeGenFileType codegen, char** ErrorMessage) {
   std::string error;
-  raw_fd_ostream dest(Filename, error, raw_fd_ostream::F_Binary);
+  raw_fd_ostream dest(Filename, error, sys::fs::F_Binary);
   formatted_raw_ostream destf(dest);
   if (!error.empty()) {
     *ErrorMessage = strdup(error.c_str());