[elements] Omit fast path in PrependElementIndices

test/mjsunit/regress/regress-crbug-630561.js

Index: test/mjsunit/regress/regress-crbug-630561.js
diff --git a/test/mjsunit/compiler/inline-dead-jscreate.js b/test/mjsunit/regress/regress-crbug-630561.js
similarity index 52%
copy from test/mjsunit/compiler/inline-dead-jscreate.js
copy to test/mjsunit/regress/regress-crbug-630561.js
index a9778758c44908f2a79288bd3439c97a0904f448..798f33d6589df5161837e705cca99f0ea869d10f 100644
--- a/test/mjsunit/compiler/inline-dead-jscreate.js
+++ b/test/mjsunit/regress/regress-crbug-630561.js
@@ -2,13 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var bar = 0;
+// Flags: --gc-interval=30
 
-function baz() { return this; }
+var dict_elements = {};
 
-function foo() {
-  bar += 1;
-  if (bar === 2) throw new baz();
+for (var i= 0; i< 100; i++) {
+  dict_elements[2147483648 + i] = i;
 }
 
-foo();
+var keys = Object.keys(dict_elements);