[torque] Add source positions for generated instance types

Change-Id: I13276e389fa71fb3de2ab3f7b685b021418acb1e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3211895
Auto-Submit: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77335}

src/torque/instance-type-generator.cc

@@ -327,8 +327,9 @@ void PrintInstanceTypes(InstanceTypeTree* root, std::ostream& definitions,
   }
   if (root->num_own_values == 1) {
     definitions << inner_indent << "V(" << type_name << ", " << root->value
-                << ") \\\n";
-    values << "  V(" << type_name << ") \\\n";
+                << ") /* " << root->type->GetPosition() << " */\\\n";
+    values << "  V(" << type_name << ") /* " << root->type->GetPosition()
+           << " */\\\n";
     std::ostream& type_checker_list =
         root->type->HasUndefinedLayout()
             ? (root->num_values == 1 ? only_declared_single_instance_types
@@ -336,7 +337,7 @@ void PrintInstanceTypes(InstanceTypeTree* root, std::ostream& definitions,
             : (root->num_values == 1 ? fully_defined_single_instance_types
                                      : fully_defined_multiple_instance_types);
     type_checker_list << "  V(" << root->type->name() << ", " << type_name
-                      << ") \\\n";
+                      << ") /* " << root->type->GetPosition() << " */ \\\n";
   }
   for (auto& child : root->children) {
     PrintInstanceTypes(child.get(), definitions, values,