Do not use ranges after range analysis.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index ea5ef9f3af7b1736b51cfcda0533a41f787bd799..e82e6e8da9b8f8ad63817e11f8cf7e4ecae7da07 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -179,12 +179,9 @@ template<int R>
 bool LTemplateResultInstruction<R>::MustSignExtendResult(
     LPlatformChunk* chunk) const {
   HValue* hvalue = this->hydrogen_value();
-
-  if (hvalue == NULL) return false;
-  if (!hvalue->representation().IsInteger32()) return false;
-  if (hvalue->HasRange() && !hvalue->range()->CanBeNegative()) return false;
-
-  return chunk->GetDehoistedKeyIds()->Contains(hvalue->id());
+  return hvalue != NULL &&
+      hvalue->representation().IsInteger32() &&
+      chunk->GetDehoistedKeyIds()->Contains(hvalue->id());
 }