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

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 997be09b3749453806a888a3e29f765b8b911383..85467598def30454c74c7c26cabde730c2c48b88 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -1936,6 +1936,10 @@ void Isolate::set_default_tag(const UserTag& tag) {
   default_tag_ = tag.raw();
 }
 
+void Isolate::set_ic_miss_function(const Function& func) {
+  ic_miss_function_ = func.raw();
+}
+
 
 void Isolate::set_deoptimized_code_array(const GrowableObjectArray& value) {
   ASSERT(Thread::Current()->IsMutatorThread());