Add missing arity check for native entry in arm64 and mips simulators.

R=fschneider@google.com

Review URL: https://codereview.chromium.org//1341623002 .

runtime/vm/native_entry.cc

@@ -184,7 +184,6 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
   bool call_through_wrapper = false;
 #ifdef USING_SIMULATOR
   bool is_native_auto_setup_scope = false;
-  intptr_t num_parameters = -1;
 #endif
 
   {
@@ -197,7 +196,6 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
     const Function& func = Function::Handle(code.function());
 #ifdef USING_SIMULATOR
     is_native_auto_setup_scope = func.IsNativeAutoSetupScope();
-    num_parameters = func.NumParameters();
 #endif
 
     if (FLAG_trace_natives) {
@@ -225,7 +223,7 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
                  Simulator::RedirectExternalReference(
                      reinterpret_cast<uword>(LinkNativeCall),
                      Simulator::kBootstrapNativeCall,
-                     func.NumParameters())));
+                     NativeEntry::kNumArguments)));
 #endif
       ASSERT(current_trampoline ==
              StubCode::CallBootstrapCFunction_entry()->EntryPoint());
@@ -248,7 +246,7 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
       patch_target_function = reinterpret_cast<NativeFunction>(
           Simulator::RedirectExternalReference(
               reinterpret_cast<uword>(patch_target_function),
-              Simulator::kBootstrapNativeCall, num_parameters));
+              Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments));
     }
 #endif
 

runtime/vm/simulator_arm64.cc

@@ -1626,6 +1626,7 @@ void Simulator::DoRedirectedCall(Instr* instr) {
       set_vregisterd(V0, 0, bit_cast<int64_t, double>(res));
       set_vregisterd(V0, 1, 0);
     } else if (redirection->call_kind() == kBootstrapNativeCall) {
+      ASSERT(redirection->argument_count() == 1);
       NativeArguments* arguments;
       arguments = reinterpret_cast<NativeArguments*>(get_register(R0));
       SimulatorBootstrapNativeCall target =

runtime/vm/simulator_mips.cc

@@ -1268,6 +1268,7 @@ void Simulator::DoBreak(Instr *instr) {
         d0 = target(d6, d7);
         set_fregister_double(F0, d0);
       } else if (redirection->call_kind() == kBootstrapNativeCall) {
+        ASSERT(redirection->argument_count() == 1);
         NativeArguments* arguments;
         arguments = reinterpret_cast<NativeArguments*>(get_register(A0));
         SimulatorBootstrapNativeCall target =