Eliminate the type distinction between BindInstr and DoInstr.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index f7e2e7c1fe6cce7e7698f3b700120644ceeb8184..4bc2ec6d3107df1f41b712690c22ad1c0f9c2548 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -302,21 +302,6 @@ void ParameterInstr::SetInputAt(intptr_t i, Value* value) {
 }
 
 
-intptr_t DoInstr::InputCount() const {
-  return computation()->InputCount();
-}
-
-
-Value* DoInstr::InputAt(intptr_t i) const {
-  return computation()->InputAt(i);
-}
-
-
-void DoInstr::SetInputAt(intptr_t i, Value* value) {
-  computation()->SetInputAt(i, value);
-}
-
-
 intptr_t GraphEntryInstr::InputCount() const {
   return 0;
 }
@@ -383,11 +368,6 @@ void Instruction::RecordAssignedVars(BitVector* assigned_vars) {
 }
 
 
-void DoInstr::RecordAssignedVars(BitVector* assigned_vars) {
-  computation()->RecordAssignedVars(assigned_vars);
-}
-
-
 void BindInstr::RecordAssignedVars(BitVector* assigned_vars) {
   computation()->RecordAssignedVars(assigned_vars);
 }