Add mips64 port.

src/codegen.h

 // Copyright 2012 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_CODEGEN_H_
 #define V8_CODEGEN_H_
 
 #include "src/code-stubs.h"
 #include "src/runtime.h"
 
@@ skipping 37 matching lines @@
 #if V8_TARGET_ARCH_IA32
 #include "src/ia32/codegen-ia32.h"  // NOLINT
 #elif V8_TARGET_ARCH_X64
 #include "src/x64/codegen-x64.h"  // NOLINT
 #elif V8_TARGET_ARCH_ARM64
 #include "src/arm64/codegen-arm64.h"  // NOLINT
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/codegen-arm.h"  // NOLINT
 #elif V8_TARGET_ARCH_MIPS
 #include "src/mips/codegen-mips.h"  // NOLINT
+#elif V8_TARGET_ARCH_MIPS64
+#include "src/mips64/codegen-mips64.h"  // NOLINT
 #elif V8_TARGET_ARCH_X87
 #include "src/x87/codegen-x87.h"  // NOLINT
 #else
 #error Unsupported target architecture.
 #endif
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 87 matching lines @@
 #ifdef DEBUG
 #ifdef V8_TARGET_ARCH_ARM64
   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
 #endif
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_H_