Fix fs::set_current_path unit test

The test fails when there is a symlink on the path because then the path
returned by current_path will not match the one we have set. Instead of
doing a string match check the unique id of the two files.

llvm-svn: 292916
diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index fb61cc7..bd57ba9 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -1151,7 +1151,11 @@
   ASSERT_NO_ERROR(fs::set_current_path(TestDirectory));
 
   ASSERT_NO_ERROR(fs::current_path(path));
-  ASSERT_EQ(TestDirectory, path);
+
+  fs::UniqueID D1, D2;
+  ASSERT_NO_ERROR(fs::getUniqueID(TestDirectory, D1));
+  ASSERT_NO_ERROR(fs::getUniqueID(path, D2));
+  ASSERT_EQ(D1, D2) << "D1: " << TestDirectory << "\nD2: " << path;
 }
 
 } // anonymous namespace