Re-reland: Remove register index/code indirection

src/compiler/register-configuration.h

-// 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.
-
-#ifndef V8_COMPILER_REGISTER_CONFIGURATION_H_
-#define V8_COMPILER_REGISTER_CONFIGURATION_H_
-
-#include "src/base/macros.h"
-
-namespace v8 {
-namespace internal {
-namespace compiler {
-
-// An architecture independent representation of the sets of registers available
-// for instruction creation.
-class RegisterConfiguration {
- public:
-  // Architecture independent maxes.
-  static const int kMaxGeneralRegisters = 32;
-  static const int kMaxDoubleRegisters = 32;
-
-  static const RegisterConfiguration* ArchDefault();
-
-  RegisterConfiguration(int num_general_registers, int num_double_registers,
-                        int num_aliased_double_registers,
-                        const char* const* general_register_name,
-                        const char* const* double_register_name);
-
-  int num_general_registers() const { return num_general_registers_; }
-  int num_double_registers() const { return num_double_registers_; }
-  int num_aliased_double_registers() const {
-    return num_aliased_double_registers_;
-  }
-
-  const char* general_register_name(int offset) const {
-    DCHECK(offset >= 0 && offset < kMaxGeneralRegisters);
-    return general_register_names_[offset];
-  }
-  const char* double_register_name(int offset) const {
-    DCHECK(offset >= 0 && offset < kMaxDoubleRegisters);
-    return double_register_names_[offset];
-  }
-
- private:
-  const int num_general_registers_;
-  const int num_double_registers_;
-  const int num_aliased_double_registers_;
-  const char* const* general_register_names_;
-  const char* const* double_register_names_;
-};
-
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_COMPILER_REGISTER_CONFIGURATION_H_