Fix hardcoded slash to native path seperator which was exposed from llvm::sys::path.

http://reviews.llvm.org/D3687

llvm-svn: 208980
diff --git a/llvm/lib/Support/Path.cpp b/llvm/lib/Support/Path.cpp
index d345829..b8d676f 100644
--- a/llvm/lib/Support/Path.cpp
+++ b/llvm/lib/Support/Path.cpp
@@ -569,6 +569,12 @@
   }
 }
 
+static const char preferred_separator_string[] = { preferred_separator, '\0' };
+
+const StringRef get_separator() {
+  return preferred_separator_string;
+}
+
 void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result) {
   result.clear();