VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
diff --git a/runtime/vm/intrinsifier_x64.cc b/runtime/vm/intrinsifier_x64.cc
index 288d5e40edabf7420aaccbab36a7636ecee77ffb..54664d539656ea5827876941b312a54a1f3948e9 100644
--- a/runtime/vm/intrinsifier_x64.cc
+++ b/runtime/vm/intrinsifier_x64.cc
@@ -1534,7 +1534,12 @@ void Intrinsifier::Random_nextState(Assembler* assembler) {
       random_class.LookupStaticFieldAllowPrivate(Symbols::_A()));
   ASSERT(!random_A_field.IsNull());
   ASSERT(random_A_field.is_const());
-  const Instance& a_value = Instance::Handle(random_A_field.StaticValue());
+  Instance& a_value = Instance::Handle(random_A_field.StaticValue());
+  if (a_value.raw() == Object::sentinel().raw() ||
+      a_value.raw() == Object::transition_sentinel().raw()) {
+    random_A_field.EvaluateInitializer();
+    a_value = random_A_field.StaticValue();
+  }
   const int64_t a_int_value = Integer::Cast(a_value).AsInt64Value();
   // Receiver.
   __ movq(RAX, Address(RSP, + 1 * kWordSize));