if the winding of the top can't be computed, give up

src/pathops/SkPathOpsOp.cpp

Index: src/pathops/SkPathOpsOp.cpp
diff --git a/src/pathops/SkPathOpsOp.cpp b/src/pathops/SkPathOpsOp.cpp
index a24fb2ff4ce8c5504d8d9b645f760e19e08fa7a2..9472594b4a7e29f7fc045a5235feeb6e845b3cf4 100644
--- a/src/pathops/SkPathOpsOp.cpp
+++ b/src/pathops/SkPathOpsOp.cpp
@@ -46,7 +46,15 @@ static SkOpSegment* findChaseOp(SkTDArray<SkOpSpanBase*>& chase, SkOpSpanBase**
         if (sortable) {
             segment = angle->segment();
             sumMiWinding = segment->updateWindingReverse(angle);
+            if (sumMiWinding == SK_MinS32) {
+                SkASSERT(segment->globalState()->debugSkipAssert());
+                return nullptr;
+            }
             sumSuWinding = segment->updateOppWindingReverse(angle);
+            if (sumSuWinding == SK_MinS32) {
+                SkASSERT(segment->globalState()->debugSkipAssert());
+                return nullptr;
+            }
             if (segment->operand()) {
                 SkTSwap<int>(sumMiWinding, sumSuWinding);
             }