Make escape analysis preserve all representations required by HCompareNumericAndBranch.

src/hydrogen-escape-analysis.cc

 // 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 149 matching lines @@
   return check;
 }
 
 
 // Replace a field load with a given value, forcing Smi representation if
 // necessary.
 HValue* HEscapeAnalysisPhase::NewLoadReplacement(
     HLoadNamedField* load, HValue* load_value) {
   HValue* replacement = load_value;
   Representation representation = load->representation();
-  if (representation.IsSmi()) {
+  if (representation.IsSmiOrInteger32() || representation.IsDouble()) {
     Zone* zone = graph()->zone();
     HInstruction* new_instr =
         HForceRepresentation::New(zone, NULL, load_value, representation);
     new_instr->InsertAfter(load);
     replacement = new_instr;
   }
   return replacement;
 }
 
 
@@ skipping 161 matching lines @@
   for (int i = 0; i < max_fixpoint_iteration_count; i++) {
     CollectCapturedValues();
     if (captured_.is_empty()) break;
     PerformScalarReplacement();
     captured_.Clear();
   }
 }
 
 
 } }  // namespace v8::internal