merge fix from trunk for issue 410552

src/pathops/SkOpSegment.cpp

Index: src/pathops/SkOpSegment.cpp
diff --git a/src/pathops/SkOpSegment.cpp b/src/pathops/SkOpSegment.cpp
index 747cd9d4973b0087e3e0730b2f9894ead6e96f6f..336ac116be7d161d50d5461081bc9566b8aa9552 100644
--- a/src/pathops/SkOpSegment.cpp
+++ b/src/pathops/SkOpSegment.cpp
@@ -1293,7 +1293,8 @@ void SkOpSegment::addTCoincident(const SkPoint& startPt, const SkPoint& endPt, d
     double testT = test->fT;
     SkOpSpan* oTest = &other->fTs[oIndex];
     const SkPoint* oTestPt = &oTest->fPt;
-    SkASSERT(AlmostEqualUlps(*testPt, *oTestPt));
+    // paths with extreme data will fail this test and eject out of pathops altogether later on
+    // SkASSERT(AlmostEqualUlps(*testPt, *oTestPt));
     do {
         SkASSERT(test->fT < 1);
         SkASSERT(oTest->fT < 1);
@@ -1476,6 +1477,9 @@ bool SkOpSegment::calcAngles() {
     const SkOpSpan* span = &fTs[0];
     if (firstSpan->fT == 0 || span->fTiny || span->fOtherT != 1 || span->fOther->multipleEnds()) {
         index = findStartSpan(0);  // curve start intersects
+        if (fTs[index].fT == 0) {
+            return false;
+        }
         SkASSERT(index > 0);
         if (activePrior >= 0) {
             addStartSpan(index);