ubsan shift fixes

src/pathops/SkOpAngle.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOpAngle.h"
 #include "SkOpSegment.h"
 #include "SkPathOpsCurve.h"
 #include "SkTSort.h"
@@ skipping 998 matching lines @@
     }
     if ((fSectorEnd & 3) == 3) {
         fSectorEnd = (fSectorEnd + (curveBendsCCW ? 31 : 1)) & 0x1f;
     }
     crossesZero = this->checkCrossesZero();
     start = SkTMin(fSectorStart, fSectorEnd);
     int end = SkTMax(fSectorStart, fSectorEnd);
     if (!crossesZero) {
         fSectorMask = (unsigned) -1 >> (31 - end + start) << start;
     } else {
-        fSectorMask = (unsigned) -1 >> (31 - start) | (-1 << end);
+        fSectorMask = (unsigned) -1 >> (31 - start) | ((unsigned) -1 << end);
     }
 }
 
 SkOpSpan* SkOpAngle::starter() {
     return fStart->starter(fEnd);
 }
 
 bool SkOpAngle::tangentsDiverge(const SkOpAngle* rh, double s0xt0) const {
     if (s0xt0 == 0) {
         return false;
@@ skipping 14 matching lines @@
         return true;
     }
     SkASSERT(s0dt0 != 0);
     double m = s0xt0 / s0dt0;
     double sDist = sweep[0].length() * m;
     double tDist = tweep[0].length() * m;
     bool useS = fabs(sDist) < fabs(tDist);
     double mFactor = fabs(useS ? this->distEndRatio(sDist) : rh->distEndRatio(tDist));
     return mFactor < 2400;  // empirically found limit
 }