add a helper method to sys::Path for clang, patch by
Kovarththanan Rajaratnam!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54655 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index bb1252c..ff96e33 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -56,6 +56,13 @@
   FlipBackSlashes(path);
 }
 
+Path&
+Path::operator=(const std::string &that) {
+  path = that;
+  FlipBackSlashes(path);
+  return *this;
+}
+
 bool
 Path::isValid() const {
   if (path.empty())