Revert "[kernel] Stream everything. Replace .kernel_function with .kernel_offset"

runtime/vm/class_finalizer.cc

Index: runtime/vm/class_finalizer.cc
diff --git a/runtime/vm/class_finalizer.cc b/runtime/vm/class_finalizer.cc
index 13ac6751d3612cac1c4d2e1a3ea87e1228f3a7be..288e05698389fed9323d941b3c02cae9f5e03dc9 100644
--- a/runtime/vm/class_finalizer.cc
+++ b/runtime/vm/class_finalizer.cc
@@ -1631,7 +1631,7 @@ void ClassFinalizer::ResolveAndFinalizeMemberTypes(const Class& cls) {
                         /* is_native = */ false, cls, field.token_pos()));
           getter.set_result_type(type);
           getter.set_is_debuggable(false);
-          getter.set_kernel_offset(field.kernel_offset());
+          getter.set_kernel_function(field.kernel_field());
           cls.AddFunction(getter);
           field.SetStaticValue(Object::sentinel(), true);
         }
@@ -2389,7 +2389,7 @@ void ClassFinalizer::ApplyMixinMembers(const Class& cls) {
   } else {
     for (intptr_t i = 0; i < functions.Length(); i++) {
       func ^= functions.At(i);
-      ASSERT(func.kernel_offset() > 0);
+      ASSERT(func.kernel_function() != 0);
       cloned_funcs.Add(func);
     }
   }