Use the unswapped end point y for early out case in winding_line

tests/PathTest.cpp

Index: tests/PathTest.cpp
diff --git a/tests/PathTest.cpp b/tests/PathTest.cpp
index 464943b8dcc8f271d211a59a6f2d7c1e8a6c422a..aa2ffdb32f106cecb913e2acf52701d6cf5921a9 100644
--- a/tests/PathTest.cpp
+++ b/tests/PathTest.cpp
@@ -3542,6 +3542,16 @@ static void test_contains(skiatest::Reporter* reporter) {
     REPORTER_ASSERT(reporter, !p.contains(7, 7));
     p.reset();
     p.moveTo(4, 4);
+    p.lineTo(8, 4);
+    p.lineTo(8, 8);
+    p.lineTo(4, 8);
+    // test on vertices
+    REPORTER_ASSERT(reporter, p.contains(4, 4));
+    REPORTER_ASSERT(reporter, p.contains(8, 4));
+    REPORTER_ASSERT(reporter, p.contains(8, 8));
+    REPORTER_ASSERT(reporter, p.contains(4, 8));
+    p.reset();
+    p.moveTo(4, 4);
     p.lineTo(6, 8);
     p.lineTo(2, 8);
     // test on edge