Fix induction variable detection.

src/hydrogen-instructions.cc

 // Copyright 2012 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 156 matching lines @@
 }
 
 
 // This method is recursive but it is guaranteed to terminate because
 // RedefinedOperand() always dominates "this".
 bool HValue::IsRelationTrue(NumericRelation relation,
                             HValue* other,
                             int offset,
                             int scale) {
   if (this == other) {
-    return NumericRelation::Eq().Implies(relation);
+    return scale == 0 && relation.IsExtendable(offset);
   }
 
   // Test the direct relation.
   if (IsRelationTrueInternal(relation, other, offset, scale)) return true;
 
   // If scale is 0 try the reversed relation.
   if (scale == 0 &&
       // TODO(mmassi): do we need the full, recursive IsRelationTrue?
       other->IsRelationTrueInternal(relation.Reversed(), this, -offset)) {
     return true;
@@ skipping 3330 matching lines @@
 
 
 void HCheckFunction::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal