[turbofan] remove control field from instruction

test/unittests/compiler/instruction-sequence-unittest.cc

Index: test/unittests/compiler/instruction-sequence-unittest.cc
diff --git a/test/unittests/compiler/instruction-sequence-unittest.cc b/test/unittests/compiler/instruction-sequence-unittest.cc
index 6f1ac94caacb17f4173d8f04e93bdd63d86ae365..ae31f40c2e9a65ef64e9817dd424073792222d1c 100644
--- a/test/unittests/compiler/instruction-sequence-unittest.cc
+++ b/test/unittests/compiler/instruction-sequence-unittest.cc
@@ -260,22 +260,20 @@ int InstructionSequenceTest::EmitBranch(TestOperand input_op) {
                                 ConvertInputOp(Imm()), ConvertInputOp(Imm())};
   InstructionCode opcode = kArchJmp | FlagsModeField::encode(kFlags_branch) |
                            FlagsConditionField::encode(kEqual);
-  auto instruction =
-      NewInstruction(opcode, 0, nullptr, 4, inputs)->MarkAsControl();
+  auto instruction = NewInstruction(opcode, 0, nullptr, 4, inputs);
   return AddInstruction(NewIndex(), instruction);
 }
 
 
 int InstructionSequenceTest::EmitFallThrough() {
-  auto instruction = NewInstruction(kArchNop, 0, nullptr)->MarkAsControl();
+  auto instruction = NewInstruction(kArchNop, 0, nullptr);
   return AddInstruction(NewIndex(), instruction);
 }
 
 
 int InstructionSequenceTest::EmitJump() {
   InstructionOperand* inputs[1]{ConvertInputOp(Imm())};
-  auto instruction =
-      NewInstruction(kArchJmp, 0, nullptr, 1, inputs)->MarkAsControl();
+  auto instruction = NewInstruction(kArchJmp, 0, nullptr, 1, inputs);
   return AddInstruction(NewIndex(), instruction);
 }