Last snapshot bits to get working precompiled hello_world on x64.

runtime/vm/megamorphic_cache_table.cc

Index: runtime/vm/megamorphic_cache_table.cc
diff --git a/runtime/vm/megamorphic_cache_table.cc b/runtime/vm/megamorphic_cache_table.cc
index c87be9696bae2a6ecf2325a28541a7262542d469..154d0e05be34e413dcdbce5ea55d401866af0890 100644
--- a/runtime/vm/megamorphic_cache_table.cc
+++ b/runtime/vm/megamorphic_cache_table.cc
@@ -57,6 +57,10 @@ void MegamorphicCacheTable::InitMissHandler(Isolate* isolate) {
   const Code& code =
       Code::Handle(StubCode::Generate("_stub_MegamorphicMiss",
                                       StubCode::GenerateMegamorphicMissStub));
+  // When FLAG_lazy_dispatchers=false, this stub can be on the stack during
+  // exceptions, but it has a corresponding function so IsStubCode is false and
+  // it is considered in the search for an exception handler.
+  code.set_exception_handlers(Object::empty_exception_handlers());
   const Class& cls =
       Class::Handle(Type::Handle(Type::Function()).type_class());
   const Function& function =