Fix variable decl register collision on ARM.

test/mjsunit/regress/regress-455207.js

Index: test/mjsunit/regress/regress-455207.js
diff --git a/test/mjsunit/regress/regress-463028.js b/test/mjsunit/regress/regress-455207.js
similarity index 51%
copy from test/mjsunit/regress/regress-463028.js
copy to test/mjsunit/regress/regress-455207.js
index 1454ef1aea9a4ba296f99ce0531821e3ccd85aa5..88fec4a3b9718625fc6a1523cf548ca29081ca84 100644
--- a/test/mjsunit/regress/regress-463028.js
+++ b/test/mjsunit/regress/regress-455207.js
@@ -2,17 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
-
-var o = {}
-Object.defineProperty(o, "z", {
-    set: function() {
-      %DeoptimizeFunction(f);
-    },
-});
-
-function f(o) {
-  return 19 + (void(o.z = 12));
+"use strict";
+var s = "";
+for (var i = 16; i < 1085; i++) {
+  s += ("var a" + i + " = " + i + ";");
 }
-
-f(o);
+s += "const x = 10;" +
+    "assertEquals(10, x); x = 11; assertEquals(11, x)";
+assertThrows(function() { eval(s); });