Bugfix in inlined versions of Array.indexOf() and Array.lastIndexOf() with a regression test.

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
 #include "src/property-details-inl.h"
@@ skipping 1522 matching lines @@
   value()->PrintNameTo(stream);
 }
 
 
 HInstruction* HForceRepresentation::New(Zone* zone, HValue* context,
        HValue* value, Representation representation) {
   if (FLAG_fold_constants && value->IsConstant()) {
     HConstant* c = HConstant::cast(value);
     if (c->HasNumberValue()) {
       double double_res = c->DoubleValue();
-      if (representation.CanContainDouble(double_res)) {
+      if (representation.IsDouble()) {
+        return HConstant::New(zone, context, double_res);
+
+      } else if (representation.CanContainDouble(double_res)) {
         return HConstant::New(zone, context,
                               static_cast<int32_t>(double_res),
                               representation);
       }
     }
   }
   return new(zone) HForceRepresentation(value, representation);
 }
 
 
@@ skipping 3282 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal