Make test resilient against windows path separators.

llvm-svn: 249320
diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index f35682e..5d883c4 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -153,6 +153,7 @@
 
   SmallString<32> Relative("foo.cpp");
   ASSERT_NO_ERROR(sys::fs::make_absolute("/root", Relative));
+  Relative[5] = '/'; // Fix up windows paths.
   ASSERT_EQ("/root/foo.cpp", Relative);
 }