[turbofan] Remove Instruction::IsControl() and Instruction::MarkAsControl()

test/cctest/compiler/test-jump-threading.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-codes.h"
 #include "src/compiler/jump-threading.h"
@@ skipping 12 matching lines @@
         current_(NULL) {}
 
   ZoneVector<InstructionBlock*> blocks_;
   InstructionSequence sequence_;
   RpoNumber rpo_number_;
   InstructionBlock* current_;
 
   int Jump(int target) {
     Start();
     InstructionOperand ops[] = {UseRpo(target)};
-    sequence_.AddInstruction(Instruction::New(main_zone(), kArchJmp, 0, NULL, 1,
-                                              ops, 0, NULL)->MarkAsControl());
+    sequence_.AddInstruction(
+        Instruction::New(main_zone(), kArchJmp, 0, NULL, 1, ops, 0, NULL));
     int pos = static_cast<int>(sequence_.instructions().size() - 1);
     End();
     return pos;
   }
   void Fallthru() {
     Start();
     End();
   }
   int Branch(int ttarget, int ftarget) {
     Start();
     InstructionOperand ops[] = {UseRpo(ttarget), UseRpo(ftarget)};
     InstructionCode code = 119 | FlagsModeField::encode(kFlags_branch) |
                            FlagsConditionField::encode(kEqual);
-    sequence_.AddInstruction(Instruction::New(main_zone(), code, 0, NULL, 2,
-                                              ops, 0, NULL)->MarkAsControl());
+    sequence_.AddInstruction(
+        Instruction::New(main_zone(), code, 0, NULL, 2, ops, 0, NULL));
     int pos = static_cast<int>(sequence_.instructions().size() - 1);
     End();
     return pos;
   }
   void Nop() {
     Start();
     sequence_.AddInstruction(Instruction::New(main_zone(), kArchNop));
   }
   void RedundantMoves() {
     Start();
@@ skipping 693 matching lines @@
         for (int k = 4; k < 5; k++) assembly[k]--;
       }
       CheckAssemblyOrder(code, 5, assembly);
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8