Fix an assertion failure in stack trace construction.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 0ff41ba2388fb7cd34376a1e19e26d472904d9dc..6d251d11011ddecdfde84af2f9404cbb31df837a 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -900,17 +900,6 @@ void HPhi::AddInput(HValue* value) {
 }
 
 
-bool HPhi::HasReceiverOperand() {
-  for (int i = 0; i < OperandCount(); i++) {
-    if (OperandAt(i)->IsParameter() &&
-        HParameter::cast(OperandAt(i))->index() == 0) {
-      return true;
-    }
-  }
-  return false;
-}
-
-
 HValue* HPhi::GetRedundantReplacement() const {
   HValue* candidate = NULL;
   int count = OperandCount();