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[Bug #21710] - struct.c: `struct_alloc` It is possible for a `NEWOBJ` tracepoint call back to write fields into a newly allocated object before `struct_alloc` had the time to set the `RSTRUCT_GEN_FIELDS` flags and such. Hence we can't blindly initialize the `fields_obj` reference to `0` we first need to check no fields were added yet. - object.c: `rb_class_allocate_instance` Similarly, if a `NEWOBJ` tracepoint tries to set fields on the object, the `shape_id` must already be set, as it's required on T_OBJECT to know where to write fields. `NEWOBJ_OF` had to be refactored to accept a `shape_id`.