Fix a bug in intrinsified Array_setIndexed type check.

tests/language/src/OptimizationTest.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Test various optimizations and deoptimizations of optimizing compiler..
 
 addThem(a, b) {
   return a + b;
 }
 
 isItInt(a) {
   return a is int;
 }
 
 doNeg(a) {
   return -a;
 }
 
+doNeg2(a) {
+  return -a;
+}
+
 doNot(a) {
   return !a;
 }
 
 doBitNot(a) {
   return ~a;
 }
 
 main() {
   for (int i = 0; i < 2000; i++) {
@@ skipping 17 matching lines @@
   Expect.equals(minInt, doNeg(doNeg(minInt)));
   
   for (int i = 0; i < 1000; i++) {
     Expect.equals(false, doNot(true));
     Expect.equals(true, doNot(doNot(true)));
   }
   for (int i = 0; i < 1000; i++) {
     Expect.equals(-57, doBitNot(56));
     Expect.equals(55, doBitNot(-56));
   }
+
+  for (int i = 0; i < 2000; i++) {
+    Expect.equals(-2.2, doNeg2(2.2));
+  }
+  // Deoptimize.
+  Expect.equals(-5, doNeg2(5));
 }