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

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index 1980664701fd498b3be144c891e7414999226a30..9abd39b44b106b40950ed46dd9860285471de1b4 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -114,9 +114,8 @@ 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);
 }
 
 
@@ -628,8 +627,7 @@ static void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
   opcode = cont->Encode(opcode);
   if (cont->IsBranch()) {
     selector->Emit(opcode, g.NoOutput(), 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(plind): Revisit and test this path.
@@ -758,8 +756,7 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
   InstructionOperand const value_operand = g.UseRegister(value);
   if (cont->IsBranch()) {
     selector->Emit(opcode, g.NoOutput(), value_operand, g.TempImmediate(0),
-                   g.Label(cont->true_block()),
-                   g.Label(cont->false_block()))->MarkAsControl();
+                   g.Label(cont->true_block()), g.Label(cont->false_block()));
   } else {
     selector->Emit(opcode, g.DefineAsRegister(cont->result()), value_operand,
                    g.TempImmediate(0));
@@ -813,8 +810,7 @@ void InstructionSelector::VisitSwitch(Node* node, BasicBlock* default_branch,
       DCHECK_LT(value + 2, input_count);
       inputs[value + 2] = g.Label(branch);
     }
-    Emit(kArchTableSwitch, 0, nullptr, input_count, inputs, 0, nullptr)
-        ->MarkAsControl();
+    Emit(kArchTableSwitch, 0, nullptr, input_count, inputs, 0, nullptr);
     return;
   }
 
@@ -829,8 +825,7 @@ void InstructionSelector::VisitSwitch(Node* node, BasicBlock* default_branch,
     inputs[index * 2 + 2 + 0] = g.TempImmediate(value);
     inputs[index * 2 + 2 + 1] = g.Label(branch);
   }
-  Emit(kArchLookupSwitch, 0, nullptr, input_count, inputs, 0, nullptr)
-      ->MarkAsControl();
+  Emit(kArchLookupSwitch, 0, nullptr, input_count, inputs, 0, nullptr);
 }