InferRange simplifications

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 2be2a032574b6bf9af1f8560e19fe95d1694bab7..ca9cae605d5960cdc56bf075d2e3757ac90c3a2d 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -481,7 +481,6 @@ void HValue::RegisterUse(int index, HValue* new_value) {
 
 void HValue::AddNewRange(Range* r) {
   if (!HasRange()) ComputeInitialRange();
-  if (!HasRange()) range_ = new Range();
   ASSERT(HasRange());
   r->StackUpon(range_);
   range_ = r;
@@ -880,9 +879,7 @@ Range* HValue::InferRange() {
 
 Range* HConstant::InferRange() {
   if (has_int32_value_) {
-    Range* result = new Range(int32_value_, int32_value_);
-    result->set_can_be_minus_zero(false);
-    return result;
+    return new Range(int32_value_, int32_value_);
   }
   return HValue::InferRange();
 }
@@ -891,8 +888,7 @@ Range* HConstant::InferRange() {
 Range* HPhi::InferRange() {
   if (representation().IsInteger32()) {
     if (block()->IsLoopHeader()) {
-      Range* range = new Range(kMinInt, kMaxInt);
-      return range;
+      return new Range();
     } else {
       Range* range = OperandAt(0)->range()->Copy();
       for (int i = 1; i < OperandCount(); ++i) {