Initial SIMDBC interpreter.

runtime/vm/deopt_instructions.cc

Index: runtime/vm/deopt_instructions.cc
diff --git a/runtime/vm/deopt_instructions.cc b/runtime/vm/deopt_instructions.cc
index ecef27927e76447d5b42d12e0f7c89b62b6dc1cb..614b9765b8a3e62961d2fc129d740a4f491ce702 100644
--- a/runtime/vm/deopt_instructions.cc
+++ b/runtime/vm/deopt_instructions.cc
@@ -660,12 +660,16 @@ class DeoptPcMarkerInstr : public DeoptInstr {
     Function& function = Function::Handle(deopt_context->zone());
     function ^= deopt_context->ObjectAt(object_table_index_);
     if (function.IsNull()) {
+      // There are no deoptimization stubs on DBC.
+#if !defined(TARGET_ARCH_DBC)
       *reinterpret_cast<RawObject**>(dest_addr) = deopt_context->is_lazy_deopt()
           ? StubCode::DeoptimizeLazy_entry()->code()
           : StubCode::Deoptimize_entry()->code();
+#endif
       return;
     }
 
+#if !defined(TARGET_ARCH_DBC)
     // We don't always have the Code object for the frame's corresponding
     // unoptimized code as it may have been collected. Use a stub as the pc
     // marker until we can recreate that Code object during deferred
@@ -673,6 +677,7 @@ class DeoptPcMarkerInstr : public DeoptInstr {
     // a pc marker.
     *reinterpret_cast<RawObject**>(dest_addr) =
         StubCode::FrameAwaitingMaterialization_entry()->code();
+#endif
     deopt_context->DeferPcMarkerMaterialization(object_table_index_, dest_addr);
   }