Support/FileSystem: Add copy_file implementation. Not tests yet because the
file creation APIs aren't implemented.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120593 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/PathV2.cpp b/lib/Support/PathV2.cpp
index a4a3f38..dbfde54 100644
--- a/lib/Support/PathV2.cpp
+++ b/lib/Support/PathV2.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/PathV2.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <cctype>
 
@@ -666,9 +667,13 @@
   return ec;
 }
 
-}
-}
-}
+} // end namespace path
+
+namespace fs {
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm
 
 // Include the truly platform-specific parts.
 #if defined(LLVM_ON_UNIX)