[turbofan] Next step towards shared operators.

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 16c4c6977aa5c0b6a25e06305747ef676592bd18..95bed128015213784e7f32c14117028fc2f01782 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -81,104 +81,105 @@ class CommonOperatorBuilder {
   return new (zone_) ControlOperator(IrOpcode::k##name, Operator::kFoldable, \
                                      inputs, 0, controls, #name);
 
-  Operator* Start(int num_formal_parameters) {
+  const Operator* Start(int num_formal_parameters) {
     // Outputs are formal parameters, plus context, receiver, and JSFunction.
     int outputs = num_formal_parameters + 3;
     return new (zone_) ControlOperator(IrOpcode::kStart, Operator::kFoldable, 0,
                                        outputs, 0, "Start");
   }
-  Operator* Dead() { CONTROL_OP(Dead, 0, 0); }
-  Operator* End() { CONTROL_OP(End, 0, 1); }
-  Operator* Branch() { CONTROL_OP(Branch, 1, 1); }
-  Operator* IfTrue() { CONTROL_OP(IfTrue, 0, 1); }
-  Operator* IfFalse() { CONTROL_OP(IfFalse, 0, 1); }
-  Operator* Throw() { CONTROL_OP(Throw, 1, 1); }
+  const Operator* Dead() { CONTROL_OP(Dead, 0, 0); }
+  const Operator* End() { CONTROL_OP(End, 0, 1); }
+  const Operator* Branch() { CONTROL_OP(Branch, 1, 1); }
+  const Operator* IfTrue() { CONTROL_OP(IfTrue, 0, 1); }
+  const Operator* IfFalse() { CONTROL_OP(IfFalse, 0, 1); }
+  const Operator* Throw() { CONTROL_OP(Throw, 1, 1); }
 
-  Operator* Return() {
+  const Operator* Return() {
     return new (zone_) ControlOperator(
         IrOpcode::kReturn, Operator::kNoProperties, 1, 0, 1, "Return");
   }
 
-  Operator* Merge(int controls) {
+  const Operator* Merge(int controls) {
     return new (zone_) ControlOperator(IrOpcode::kMerge, Operator::kFoldable, 0,
                                        0, controls, "Merge");
   }
 
-  Operator* Loop(int controls) {
+  const Operator* Loop(int controls) {
     return new (zone_) ControlOperator(IrOpcode::kLoop, Operator::kFoldable, 0,
                                        0, controls, "Loop");
   }
 
-  Operator* Parameter(int index) {
+  const Operator* Parameter(int index) {
     return new (zone_) Operator1<int>(IrOpcode::kParameter, Operator::kPure, 1,
                                       1, "Parameter", index);
   }
-  Operator* Int32Constant(int32_t value) {
+  const Operator* Int32Constant(int32_t value) {
     return new (zone_)
         Operator1<int32_t>(IrOpcode::kInt32Constant, Operator::kPure, 0, 1,
                            "Int32Constant", value);
   }
-  Operator* Int64Constant(int64_t value) {
+  const Operator* Int64Constant(int64_t value) {
     return new (zone_)
         Operator1<int64_t>(IrOpcode::kInt64Constant, Operator::kPure, 0, 1,
                            "Int64Constant", value);
   }
-  Operator* Float64Constant(double value) {
+  const Operator* Float64Constant(double value) {
     return new (zone_)
         Operator1<double>(IrOpcode::kFloat64Constant, Operator::kPure, 0, 1,
                           "Float64Constant", value);
   }
-  Operator* ExternalConstant(ExternalReference value) {
+  const Operator* ExternalConstant(ExternalReference value) {
     return new (zone_) Operator1<ExternalReference>(IrOpcode::kExternalConstant,
                                                     Operator::kPure, 0, 1,
                                                     "ExternalConstant", value);
   }
-  Operator* NumberConstant(double value) {
+  const Operator* NumberConstant(double value) {
     return new (zone_)
         Operator1<double>(IrOpcode::kNumberConstant, Operator::kPure, 0, 1,
                           "NumberConstant", value);
   }
-  Operator* HeapConstant(Unique<Object> value) {
+  const Operator* HeapConstant(Unique<Object> value) {
     return new (zone_) Operator1<Unique<Object> >(
         IrOpcode::kHeapConstant, Operator::kPure, 0, 1, "HeapConstant", value);
   }
-  Operator* Phi(MachineType type, int arguments) {
+  const Operator* Phi(MachineType type, int arguments) {
     DCHECK(arguments > 0);  // Disallow empty phis.
     return new (zone_) Operator1<MachineType>(IrOpcode::kPhi, Operator::kPure,
                                               arguments, 1, "Phi", type);
   }
-  Operator* EffectPhi(int arguments) {
+  const Operator* EffectPhi(int arguments) {
     DCHECK(arguments > 0);  // Disallow empty phis.
     return new (zone_) Operator1<int>(IrOpcode::kEffectPhi, Operator::kPure, 0,
                                       0, "EffectPhi", arguments);
   }
-  Operator* ControlEffect() {
+  const Operator* ControlEffect() {
     return new (zone_) SimpleOperator(IrOpcode::kControlEffect, Operator::kPure,
                                       0, 0, "ControlEffect");
   }
-  Operator* ValueEffect(int arguments) {
+  const Operator* ValueEffect(int arguments) {
     DCHECK(arguments > 0);  // Disallow empty value effects.
     return new (zone_) SimpleOperator(IrOpcode::kValueEffect, Operator::kPure,
                                       arguments, 0, "ValueEffect");
   }
-  Operator* Finish(int arguments) {
+  const Operator* Finish(int arguments) {
     DCHECK(arguments > 0);  // Disallow empty finishes.
     return new (zone_) Operator1<int>(IrOpcode::kFinish, Operator::kPure, 1, 1,
                                       "Finish", arguments);
   }
-  Operator* StateValues(int arguments) {
+  const Operator* StateValues(int arguments) {
     return new (zone_) Operator1<int>(IrOpcode::kStateValues, Operator::kPure,
                                       arguments, 1, "StateValues", arguments);
   }
-  Operator* FrameState(BailoutId bailout_id, OutputFrameStateCombine combine) {
+  const Operator* FrameState(BailoutId bailout_id,
+                             OutputFrameStateCombine combine) {
     return new (zone_) Operator1<FrameStateCallInfo>(
         IrOpcode::kFrameState, Operator::kPure, 4, 1, "FrameState",
         FrameStateCallInfo(bailout_id, combine));
   }
-  Operator* Call(CallDescriptor* descriptor) {
+  const Operator* Call(CallDescriptor* descriptor) {
     return new (zone_) CallOperator(descriptor, "Call");
   }
-  Operator* Projection(size_t index) {
+  const Operator* Projection(size_t index) {
     return new (zone_) Operator1<size_t>(IrOpcode::kProjection, Operator::kPure,
                                          1, 1, "Projection", index);
   }