[turbofan] Add DebugBreak machine operator and support

src/compiler/raw-machine-assembler.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/raw-machine-assembler.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/scheduler.h"
@@ skipping 117 matching lines @@
 }
 
 
 void RawMachineAssembler::Return(Node* v1, Node* v2, Node* v3) {
   Node* values[] = {v1, v2, v3};
   Node* ret = MakeNode(common()->Return(3), 3, values);
   schedule()->AddReturn(CurrentBlock(), ret);
   current_block_ = nullptr;
 }
 
+void RawMachineAssembler::DebugBreak() { AddNode(machine()->DebugBreak()); }
 
 Node* RawMachineAssembler::CallN(CallDescriptor* desc, Node* function,
                                  Node** args) {
   int param_count =
       static_cast<int>(desc->GetMachineSignature()->parameter_count());
   int input_count = param_count + 1;
   Node** buffer = zone()->NewArray<Node*>(input_count);
   int index = 0;
   buffer[index++] = function;
   for (int i = 0; i < param_count; i++) {
@@ skipping 341 matching lines @@
   // The raw machine assembler nodes do not have effect and control inputs,
   // so we disable checking input counts here.
   return graph()->NewNodeUnchecked(op, input_count, inputs);
 }
 
 RawMachineLabel::~RawMachineLabel() { DCHECK(bound_ || !used_); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8