[interpreter, debugger] implement debugger statement.

src/interpreter/bytecode-generator.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/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/control-flow-builders.h"
@@ skipping 1192 matching lines @@
 
   // Pending message object is restored on exit.
   builder()->CallRuntime(Runtime::kInterpreterSetPendingMessage, message, 1);
 
   // Dynamic dispatch after the finally-block.
   commands.ApplyDeferredCommands();
 }
 
 
 void BytecodeGenerator::VisitDebuggerStatement(DebuggerStatement* stmt) {
-  UNIMPLEMENTED();
+  builder()->Debugger();
 }
 
 
 void BytecodeGenerator::VisitFunctionLiteral(FunctionLiteral* expr) {
   // Find or build a shared function info.
   Handle<SharedFunctionInfo> shared_info =
       Compiler::GetSharedFunctionInfo(expr, info()->script(), info());
   CHECK(!shared_info.is_null());  // TODO(rmcilroy): Set stack overflow?
   builder()->CreateClosure(shared_info,
                            expr->pretenure() ? TENURED : NOT_TENURED);
@@ skipping 1328 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8