Let AddDictionaryElement / AddFastElement purely add, move transition heuristics to AddDataElement

test/mjsunit/arguments.js

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 //       notice, this list of conditions and the following disclaimer.
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+// Flags: --allow-natives-syntax
+
 function argc0() {
   return arguments.length;
 }
 
 function argc1(i) {
   return arguments.length;
 }
 
 function argc2(i, j) {
   return arguments.length;
@@ skipping 143 matching lines @@
 assertArrayEquals([2, 5, 5], f1(3, 5));
 assertArrayEquals([3, 5, 5, 7], f1(3, 5, 7));
 
 // Check out of bounds behavior.
 function arg_get(x) { return arguments[x]; }
 function arg_del(x) { return delete arguments[x]; }
 function arg_set(x) { return (arguments[x] = 117); }
 assertEquals(undefined, arg_get(0xFFFFFFFF));
 assertEquals(true, arg_del(0xFFFFFFFF));
 assertEquals(117, arg_set(0xFFFFFFFF));
+
+(function() {
+  function f(a) { return arguments; }
+  var a = f(1,2,3);
+  // Turn arguments into slow.
+  assertTrue(%HasSloppyArgumentsElements(a));
+  a[10000] = 1;
+  assertTrue(%HasSloppyArgumentsElements(a));
+  // Make it fast again by adding values.
+  for (var i = 0; i < 1000; i++) {
+    a[i] = 1.5;
+  }
+  assertTrue(%HasSloppyArgumentsElements(a));
+})();