Initial SIMDBC interpreter.

runtime/vm/native_entry.cc

Index: runtime/vm/native_entry.cc
diff --git a/runtime/vm/native_entry.cc b/runtime/vm/native_entry.cc
index a5c79d3731a4d6c63153b04bc5f34e0c02157606..5a7cca9043ed4992abbfe566528bbf4d467e8878 100644
--- a/runtime/vm/native_entry.cc
+++ b/runtime/vm/native_entry.cc
@@ -90,7 +90,7 @@ const uint8_t* NativeEntry::ResolveSymbol(uword pc) {
 
 uword NativeEntry::NativeCallWrapperEntry() {
   uword entry = reinterpret_cast<uword>(NativeEntry::NativeCallWrapper);
-#if defined(USING_SIMULATOR)
+#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
   entry = Simulator::RedirectExternalReference(
       entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
 #endif
@@ -198,7 +198,7 @@ static NativeFunction ResolveNativeFunction(Zone* zone,
 
 uword NativeEntry::LinkNativeCallEntry() {
   uword entry = reinterpret_cast<uword>(NativeEntry::LinkNativeCall);
-#if defined(USING_SIMULATOR)
+#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
   entry = Simulator::RedirectExternalReference(
       entry, Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments);
 #endif
@@ -236,7 +236,7 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
         arguments->thread()->zone(), func, &is_bootstrap_native);
     ASSERT(target_function != NULL);
 
-#if defined(DEBUG)
+#if defined(DEBUG) && !defined(TARGET_ARCH_DBC)
     {
       NativeFunction current_function = NULL;
       const Code& current_trampoline = Code::Handle(
@@ -260,12 +260,17 @@ void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
 #endif
 
     call_through_wrapper = !is_bootstrap_native;
-    const Code& trampoline = Code::Handle(call_through_wrapper ?
-        StubCode::CallNativeCFunction_entry()->code() :
-        StubCode::CallBootstrapCFunction_entry()->code());
+    const Code& trampoline =
+#if !defined(TARGET_ARCH_DBC)
+        Code::Handle(call_through_wrapper ?
+            StubCode::CallNativeCFunction_entry()->code() :
+            StubCode::CallBootstrapCFunction_entry()->code());
+#else
+        Code::Handle();
+#endif
 
     NativeFunction patch_target_function = target_function;
-#if defined(USING_SIMULATOR)
+#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
     if (!call_through_wrapper) {
       patch_target_function = reinterpret_cast<NativeFunction>(
           Simulator::RedirectExternalReference(