Relax TransitionElementsKind DependsOn/Changes dependencies.

test/mjsunit/elements-transition-hoisting.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 152 matching lines @@
       assertTrue(true);
       a[0] = object;
     } while (--count > 3);
   }
 
   testHoistingWithSideEffect(new Array(5));
   %OptimizeFunctionOnNextCall(testHoistingWithSideEffect);
   testHoistingWithSideEffect(new Array(5));
   testHoistingWithSideEffect(new Array(5));
   assertTrue(2 != %GetOptimizationStatus(testHoistingWithSideEffect));
+
+  function testStraightLineDupeElinination(a,b,c,d,e,f) {
+    var count = 3;
+    do {
+      assertTrue(true);
+      a[0] = b;
+      a[1] = c;
+      a[2] = d;
+      assertTrue(true);
+      a[3] = e; // TransitionElementsKind should be eliminated despite call.
+      a[4] = f;
+    } while (--count > 3);
+  }
+
+  testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,0,0,.5);
+  testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,0,.5,0);
+  testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,.5,0,0);
+  testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,.5,0,0,0);
+  testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),.5,0,0,0,0);
+  testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,0,0,.5);
+  testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,0,.5,0);
+  testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,.5,0,0);
+  testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,.5,0,0,0);
+  testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),.5,0,0,0,0);
+  testStraightLineDupeElinination(new Array(5),.5,0,0,0,0);
+  testStraightLineDupeElinination(new Array(5),0,.5,0,0,0);
+  testStraightLineDupeElinination(new Array(5),0,0,.5,0,0);
+  testStraightLineDupeElinination(new Array(5),0,0,0,.5,0);
+  testStraightLineDupeElinination(new Array(5),0,0,0,0,.5);
+  testStraightLineDupeElinination(new Array(5),.5,0,0,0,0);
+  testStraightLineDupeElinination(new Array(5),0,.5,0,0,0);
+  testStraightLineDupeElinination(new Array(5),0,0,.5,0,0);
+  testStraightLineDupeElinination(new Array(5),0,0,0,.5,0);
+  testStraightLineDupeElinination(new Array(5),0,0,0,0,.5);
+  %OptimizeFunctionOnNextCall(testStraightLineDupeElinination);
+  testStraightLineDupeElinination(new Array(5));
+  testStraightLineDupeElinination(new Array(5));
+  assertTrue(2 != %GetOptimizationStatus(testStraightLineDupeElinination));
 }