[turbofan] remove control field from instruction

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 16063ab43b41c4b25e0618620a6f213b06985d42..06ae73e0efd039c8a8d5386b842c2ca776dd1b6b 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -374,9 +374,8 @@ static void VisitBinop(InstructionSelector* selector, Node* node,
   DCHECK_GE(arraysize(inputs), input_count);
   DCHECK_GE(arraysize(outputs), output_count);
 
-  Instruction* instr = selector->Emit(cont->Encode(opcode), output_count,
-                                      outputs, input_count, inputs);
-  if (cont->IsBranch()) instr->MarkAsControl();
+  selector->Emit(cont->Encode(opcode), output_count, outputs, input_count,
+                 inputs);
 }
 
 
@@ -776,8 +775,7 @@ void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
   IA32OperandGenerator g(selector);
   if (cont->IsBranch()) {
     selector->Emit(cont->Encode(opcode), NULL, left, right,
-                   g.Label(cont->true_block()),
-                   g.Label(cont->false_block()))->MarkAsControl();
+                   g.Label(cont->true_block()), g.Label(cont->false_block()));
   } else {
     DCHECK(cont->IsSet());
     // TODO(titzer): Needs byte register.