Add mips64 port.

src/sampler.cc

Index: src/sampler.cc
diff --git a/src/sampler.cc b/src/sampler.cc
index f89978f1be6ff5f3d6e29e0f57b2a55dc3b72620..f3a0397dc03008df64572526dc4eafb0d57993b6 100644
--- a/src/sampler.cc
+++ b/src/sampler.cc
@@ -256,6 +256,12 @@ class SimulatorHelper {
         Simulator::sp));
     state->fp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::fp));
+#elif V8_TARGET_ARCH_MIPS64
+    state->pc = reinterpret_cast<Address>(simulator_->get_pc());
+    state->sp = reinterpret_cast<Address>(simulator_->get_register(
+        Simulator::sp));
+    state->fp = reinterpret_cast<Address>(simulator_->get_register(
+        Simulator::fp));
 #endif
   }
 
@@ -393,6 +399,10 @@ void SignalHandler::HandleProfilerSignal(int signal, siginfo_t* info,
   state.pc = reinterpret_cast<Address>(mcontext.pc);
   state.sp = reinterpret_cast<Address>(mcontext.gregs[29]);
   state.fp = reinterpret_cast<Address>(mcontext.gregs[30]);
+#elif V8_HOST_ARCH_MIPS64
+  state.pc = reinterpret_cast<Address>(mcontext.pc);
+  state.sp = reinterpret_cast<Address>(mcontext.gregs[29]);
+  state.fp = reinterpret_cast<Address>(mcontext.gregs[30]);
 #endif  // V8_HOST_ARCH_*
 #elif V8_OS_MACOSX
 #if V8_HOST_ARCH_X64