[turbofan] remove control field from instruction

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 2dfd40134382024e3cabc88383af47dcadb29bdc..9b9ac9e008ada3897ac300451d81290a9fe4c92d 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -351,9 +351,8 @@ 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);
 }
 
 
@@ -977,7 +976,7 @@ static void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
   opcode = cont->Encode(opcode);
   if (cont->IsBranch()) {
     selector->Emit(opcode, NULL, left, right, g.Label(cont->true_block()),
-                   g.Label(cont->false_block()))->MarkAsControl();
+                   g.Label(cont->false_block()));
   } else {
     DCHECK(cont->IsSet());
     selector->Emit(opcode, g.DefineAsRegister(cont->result()), left, right);