Support/PathV2: Add native implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120539 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/Path.cpp b/unittests/Support/Path.cpp
index 823b078..8570047 100644
--- a/unittests/Support/Path.cpp
+++ b/unittests/Support/Path.cpp
@@ -107,6 +107,9 @@
     if (error_code ec = sys::path::replace_extension(temp_store, "ext"))
       ASSERT_FALSE(ec.message().c_str());
     outs() << "    replace_extension: " << temp_store << '\n';
+    if (error_code ec = sys::path::native(*i, temp_store))
+      ASSERT_FALSE(ec.message().c_str());
+    outs() << "    native: " << temp_store << '\n';
 
     outs().flush();
   }