Precompilation: Generate instance calls as IC calls that can switch to Megamoprhic calls.

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 368c30fe46073b069ec42081eb0b08bdc3537dd6..36ce35e28b88b9ff87af6fe7c662aef17bef6778 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -353,6 +353,10 @@ RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   if (!Dart::IsRunningPrecompiledCode()) {
     MegamorphicCacheTable::InitMissHandler(I);
   }
+  const Code& miss_code =
+      Code::Handle(I->object_store()->megamorphic_miss_code());
+  I->set_ic_miss_code(miss_code);
+
   if (snapshot_buffer == NULL) {
     if (!I->object_store()->PreallocateObjects()) {
       return I->object_store()->sticky_error();