Remove redundant data member from HChange instructions.

The target representation is already stored as part of HValue::representation().
Review URL: http://codereview.chromium.org/6794014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7493 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -726,7 +726,7 @@ void HTypeofIs::PrintDataTo(StringStream* stream) {
 
 void HChange::PrintDataTo(StringStream* stream) {
   HUnaryOperation::PrintDataTo(stream);
-  stream->Add(" %s to %s", from_.Mnemonic(), to_.Mnemonic());
+  stream->Add(" %s to %s", from_.Mnemonic(), to().Mnemonic());
 
   if (CanTruncateToInt32()) stream->Add(" truncating-int32");
   if (CheckFlag(kBailoutOnMinusZero)) stream->Add(" -0?");

src/hydrogen-instructions.h

@@ -932,7 +932,7 @@ class HChange: public HUnaryOperation {
           Representation from,
           Representation to,
           bool is_truncating)
-      : HUnaryOperation(value), from_(from), to_(to) {
+      : HUnaryOperation(value), from_(from) {
     ASSERT(!from.IsNone() && !to.IsNone());
     ASSERT(!from.Equals(to));
     set_representation(to);
@@ -947,7 +947,7 @@ class HChange: public HUnaryOperation {
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
 
   Representation from() const { return from_; }
-  Representation to() const { return to_; }
+  Representation to() const { return representation(); }
   virtual Representation RequiredInputRepresentation(int index) const {
     return from_;
   }
@@ -969,7 +969,6 @@ class HChange: public HUnaryOperation {
 
  private:
   Representation from_;
-  Representation to_;
 };