Fix Array index dehoisting.

test/mjsunit/regress/regress-264203.js

 // Copyright 2013 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
 function foo(x) {
-  var a = x + 1;
-  var b = x + 2;
-  if (x != 0) {
-    if (x > 0 & x < 100) {
-      return a;
-    }
+  var a = [1, 2, 3, 4, 5, 6, 7, 8];
+  a[x + 5];
+  var result;
+  for (var i = 0; i < 3; i++) {
+    result = a[0 - x];
   }
-  return 0;
+  return result;
 }
 
-assertEquals(0, foo(0));
-assertEquals(0, foo(0));
+foo(0);
+foo(0);
 %OptimizeFunctionOnNextCall(foo);
-assertEquals(3, foo(2));
+var r = foo(-2);
+assertEquals(3, r);