Don't crash in Array.join() if the resulting string exceeds the max string length.

test/mjsunit/regress/regress-336820.js

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-// Flags: --allow-natives-syntax
-
-function foo(x, y) {
-  return Math.floor(x / y);
-}
-
-function bar(x, y) {
-  return foo(x + 1, y + 1);
-}
-
-foo(16, "4");
-
-bar(64, 2);
-%OptimizeFunctionOnNextCall(bar);
-bar(64, 2);
+assertThrows((function() {
+  s = "Hello World!\n";
+  while (true) {
+    x = new Array();
+    x[0] = s;
+    x[1000] = s;
+    x[1000000] = s;
+    s = x.join("::");
+  }}), RangeError);