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

src/compiler/instruction-selector.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/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 943 matching lines @@
   // We must emit a NOP here because every live range needs a defining
   // instruction in the register allocator.
   OperandGenerator g(this);
   Emit(kArchNop, g.DefineAsConstant(node));
 }
 
 
 void InstructionSelector::VisitGoto(BasicBlock* target) {
   // jump to the next block.
   OperandGenerator g(this);
-  Emit(kArchJmp, g.NoOutput(), g.Label(target))->MarkAsControl();
+  Emit(kArchJmp, g.NoOutput(), g.Label(target));
 }
 
 
 void InstructionSelector::VisitReturn(Node* value) {
   OperandGenerator g(this);
   if (value != NULL) {
     Emit(kArchRet, g.NoOutput(),
          g.UseLocation(value, linkage()->GetReturnLocation(),
                        linkage()->GetReturnType()));
   } else {
@@ skipping 149 matching lines @@
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8