[interpreter] Add basic framework for bytecode handler code generation.

src/interpreter/bytecodes.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/bytecodes.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+// static
+const char* Bytecodes::ToString(Bytecode bytecode) {
+  switch (bytecode) {
+#define CASE(Name, _)       \
+    case Bytecode::k##Name: \
+      return #Name;
+    BYTECODE_LIST(CASE)
+#undef CASE
+  }
+  UNREACHABLE();
+  return "";
+}
+
+
+// static
+const int Bytecodes::NumberOfArguments(Bytecode bytecode) {
+  switch (bytecode) {
+#define CASE(Name, arg_count)   \
+    case Bytecode::k##Name:     \
+      return arg_count;
+    BYTECODE_LIST(CASE)
+#undef CASE
+  }
+  UNREACHABLE();
+  return 0;
+}
+
+
+// static
+const int Bytecodes::Size(Bytecode bytecode) {
+  return NumberOfArguments(bytecode) + 1;
+}
+
+
+std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode) {
+  return os << Bytecodes::ToString(bytecode);
+}
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8