[interpreter, debugger] implement debugger statement.

test/cctest/interpreter/test-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/v8.h"
 
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-generator.h"
 #include "src/interpreter/interpreter.h"
@@ skipping 8323 matching lines @@
   };
   // clang-format on
 
   for (size_t i = 0; i < arraysize(snippets); i++) {
     Handle<BytecodeArray> bytecode_array =
         helper.MakeBytecodeForFunctionBody(snippets[i].code_snippet);
     CheckBytecodeArrayEqual(snippets[i], bytecode_array);
   }
 }
 
+TEST(DoDebugger) {
+  InitializedHandleScope handle_scope;
+  BytecodeGeneratorHelper helper;
+
+  // clang-format off
+  ExpectedSnippet<const char*> snippet = {
+      "debugger;",
+       0,
+       1,
+       4,
+       {
+           B(StackCheck),    //
+           B(Debugger),      //
+           B(LdaUndefined),  //
+           B(Return)         //
+       },
+       0
+  };
+  // clang-format on
+
+  Handle<BytecodeArray> bytecode_array =
+      helper.MakeBytecodeForFunctionBody(snippet.code_snippet);
+  CheckBytecodeArrayEqual(snippet, bytecode_array);
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8