Add mips64 port.

src/base/platform/platform-posix.cc

 // 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.
 
 // Platform-specific code for POSIX goes here. This is not a platform on its
 // own, but contains the parts which are the same across the POSIX platforms
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <dlfcn.h>
 #include <errno.h>
@@ skipping 272 matching lines @@
 }
 
 
 void OS::DebugBreak() {
 #if V8_HOST_ARCH_ARM
   asm("bkpt 0");
 #elif V8_HOST_ARCH_ARM64
   asm("brk 0");
 #elif V8_HOST_ARCH_MIPS
   asm("break");
+#elif V8_HOST_ARCH_MIPS64
+  asm("break");
 #elif V8_HOST_ARCH_IA32
 #if defined(__native_client__)
   asm("hlt");
 #else
   asm("int $3");
 #endif  // __native_client__
 #elif V8_HOST_ARCH_X64
   asm("int $3");
 #else
 #error Unsupported host architecture.
@@ skipping 423 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   ASSERT_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::base