[interpreter, debugger] implement debugger statement.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 1503 matching lines @@
 void BytecodeGraphBuilder::VisitJumpIfUndefinedConstantWide() {
   BuildJumpIfEqual(jsgraph()->UndefinedConstant());
 }
 
 void BytecodeGraphBuilder::VisitReturn() {
   Node* control =
       NewNode(common()->Return(), environment()->LookupAccumulator());
   MergeControlToLeaveFunction(control);
 }
 
+void BytecodeGraphBuilder::VisitDebugger() {
+  FrameStateBeforeAndAfter states(this);
+  Node* call =
+      NewNode(javascript()->CallRuntime(Runtime::kHandleDebuggerStatement));
+  environment()->BindAccumulator(call, &states);
+}
+
 void BytecodeGraphBuilder::BuildForInPrepare() {
   FrameStateBeforeAndAfter states(this);
   Node* receiver = environment()->LookupAccumulator();
   Node* prepare = NewNode(javascript()->ForInPrepare(), receiver);
   environment()->BindRegistersToProjections(
       bytecode_iterator().GetRegisterOperand(0), prepare, &states);
 }
 
 void BytecodeGraphBuilder::VisitForInPrepare() { BuildForInPrepare(); }
 
@@ skipping 294 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8