message: [unittests] Fix the File System Test on Windows
  Two of the file system tests are failing on Windows - this updates them to expect the correct values after the refactor of the file system code.
diff: @@ -225,11 +225,7 @@ TEST(FileSystemTest, MakeAbsolute) {
  SmallString<16> foo(foo_relative);
  auto EC = fs.MakeAbsolute(foo);
  EXPECT_FALSE(EC);
  -#ifdef _WIN32
  - EXPECT_TRUE(foo.equals("\\foo"));
  -#else
  EXPECT_TRUE(foo.equals("/foo"));
  -#endif
  }
  {
  @@ -247,11 +243,7 @@ TEST(FileSystemTest, Resolve) {
  StringRef foo_relative = "foo";
  SmallString<16> foo(foo_relative);
  fs.Resolve(foo);
  -#ifdef _WIN32
  - EXPECT_TRUE(foo.equals("\\foo"));
  -#else
  EXPECT_TRUE(foo.equals("/foo"));
  -#endif
  }
  {
  