Fix bug in constant propagation with double-equality.

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 5168 matching lines @@
 
 
 void ConstantPropagator::VisitEqualityCompare(EqualityCompareInstr* instr) {
   const Object& left = instr->left()->definition()->constant_value();
   const Object& right = instr->right()->definition()->constant_value();
 
   if (instr->left()->definition() == instr->right()->definition()) {
     // Fold x == x, and x != x to true/false for numbers and checked strict
     // comparisons.
     if (instr->is_checked_strict_equal() ||
-        RawObject::IsNumberClassId(instr->receiver_class_id())) {
+        RawObject::IsIntegerClassId(instr->receiver_class_id())) {
       return SetValue(instr,
                       (instr->kind() == Token::kEQ)
                         ? Bool::True()
                         : Bool::False());
     }
   }
 
   if (IsNonConstant(left) || IsNonConstant(right)) {
     SetValue(instr, non_constant_);
   } else if (IsConstant(left) && IsConstant(right)) {
@@ skipping 1386 matching lines @@
 
   // Insert materializations at environment uses.
   const Class& cls = Class::Handle(alloc->constructor().Owner());
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, cls, *fields);
   }
 }
 
 
 }  // namespace dart