fix some pathops bugs found in 1M skps

tests/PathOpsSimplifyTest.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 "PathOpsExtendedTest.h"
 
 #define TEST(name) { name, #name }
 
@@ skipping 4976 matching lines @@
 path.moveTo(SkBits2Float(0x43ef6720), SkBits2Float(0x42480000));  // 478.806f, 50
 path.conicTo(SkBits2Float(0x43ef6720), SkBits2Float(0x00000000), SkBits2Float(0x43d66720), SkBits2Float(0x00000000), SkBits2Float(0x3f3504f3));  // 478.806f, 0, 428.806f, 0, 0.707107f
 path.conicTo(SkBits2Float(0x43bd6720), SkBits2Float(0x00000000), SkBits2Float(0x43bd6720), SkBits2Float(0x42480000), SkBits2Float(0x3f3504f3));  // 378.806f, 0, 378.806f, 50, 0.707107f
 path.conicTo(SkBits2Float(0x43bd6720), SkBits2Float(0x42c80000), SkBits2Float(0x43d66720), SkBits2Float(0x42c80000), SkBits2Float(0x3f3504f3));  // 378.806f, 100, 428.806f, 100, 0.707107f
 path.conicTo(SkBits2Float(0x43ef6720), SkBits2Float(0x42c80000), SkBits2Float(0x43ef6720), SkBits2Float(0x42480000), SkBits2Float(0x3f3504f3));  // 478.806f, 100, 478.806f, 50, 0.707107f
 path.close();
 
     testSimplify(reporter, path, filename);
 }
 
+static void fuzz_twister(skiatest::Reporter* reporter, const char* filename) {
+    SkPath path;
+    path.setFillType((SkPath::FillType) 0);
+path.moveTo(0, 600);
+path.lineTo(3.35544e+07f, 600);
+path.lineTo(3.35544e+07f, 0);
+path.lineTo(0, 0);
+path.lineTo(0, 600);
+path.close();
+path.moveTo(63, 600);
+path.lineTo(3.35545e+07f, 600);
+path.lineTo(3.35545e+07f, 0);
+path.lineTo(63, 0);
+path.lineTo(63, 600);
+path.close();
+path.moveTo(93, 600);
+path.lineTo(3.35545e+07f, 600);
+path.lineTo(3.35545e+07f, 0);
+path.lineTo(93, 0);
+path.lineTo(93, 600);
+path.close();
+path.moveTo(123, 600);
+path.lineTo(3.35546e+07f, 600);
+path.lineTo(3.35546e+07f, 0);
+path.lineTo(123, 0);
+path.lineTo(123, 600);
+path.close();
+    testSimplify(reporter, path, filename);
+}
+
 static void (*skipTest)(skiatest::Reporter* , const char* filename) = 0;
 static void (*firstTest)(skiatest::Reporter* , const char* filename) = 0;
 static void (*stopTest)(skiatest::Reporter* , const char* filename) = 0;
 
 static TestDesc tests[] = {
+    TEST(fuzz_twister),
     TEST(fuzz994s_3414),
     TEST(fuzz994s_11),
     TEST(cr514118),
     TEST(fuzz864a),
     TEST(testQuads65),
     TEST(testIssue3838_3),
     TEST(testIssue3838),
     TEST(testArc),
     TEST(testTriangle2),
     TEST(testTriangle1),
@@ skipping 432 matching lines @@
 
 DEF_TEST(PathOpsSimplify, reporter) {
     if (runSubTests && runSubTestsFirst) {
         RunTestSet(reporter, subTests, subTestCount, firstSubTest, nullptr, stopTest, runReverse);
     }
     RunTestSet(reporter, tests, testCount, firstTest, skipTest, stopTest, runReverse);
     if (runSubTests && !runSubTestsFirst) {
         RunTestSet(reporter, subTests, subTestCount, firstSubTest, nullptr, stopTest, runReverse);
     }
 }