[turbofan] Add DebugBreak machine operator and support

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/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 882 matching lines @@
     case IrOpcode::kCall:
       return VisitCall(node);
     case IrOpcode::kDeoptimizeIf:
       return VisitDeoptimizeIf(node);
     case IrOpcode::kDeoptimizeUnless:
       return VisitDeoptimizeUnless(node);
     case IrOpcode::kFrameState:
     case IrOpcode::kStateValues:
     case IrOpcode::kObjectState:
       return;
+    case IrOpcode::kDebugBreak:
+      VisitDebugBreak();
+      return;
     case IrOpcode::kLoad: {
       LoadRepresentation type = LoadRepresentationOf(node->op());
       MarkAsRepresentation(type.representation(), node);
       return VisitLoad(node);
     }
     case IrOpcode::kStore:
       return VisitStore(node);
     case IrOpcode::kWord32And:
       return MarkAsWord32(node), VisitWord32And(node);
     case IrOpcode::kWord32Or:
@@ skipping 865 matching lines @@
   }
   EmitDeoptimize(opcode, 0, nullptr, 0, nullptr, value);
 }
 
 
 void InstructionSelector::VisitThrow(Node* value) {
   OperandGenerator g(this);
   Emit(kArchThrowTerminator, g.NoOutput());
 }
 
+void InstructionSelector::VisitDebugBreak() {
+  OperandGenerator g(this);
+  Emit(kArchDebugBreak, g.NoOutput());
+}
 
 FrameStateDescriptor* InstructionSelector::GetFrameStateDescriptor(
     Node* state) {
   DCHECK(state->opcode() == IrOpcode::kFrameState);
   DCHECK_EQ(kFrameStateInputCount, state->InputCount());
   FrameStateInfo state_info = OpParameter<FrameStateInfo>(state);
 
   int parameters = static_cast<int>(
       StateValuesAccess(state->InputAt(kFrameStateParametersInput)).size());
   int locals = static_cast<int>(
@@ skipping 13 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8