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4f47327287
to fix inconsistent and wrong current namespace detections. This includes: * Moving load_path and related things from rb_vm_t to rb_namespace_t to simplify accessing those values via namespace (instead of accessing either vm or ns) * Initializing root_namespace earlier and consolidate builtin_namespace into root_namespace * Adding VM_FRAME_FLAG_NS_REQUIRE for checkpoints to detect a namespace to load/require files * Removing implicit refinements in the root namespace which was used to determine the namespace to be loaded (replaced by VM_FRAME_FLAG_NS_REQUIRE) * Removing namespaces from rb_proc_t because its namespace can be identified by lexical context * Starting to use ep[VM_ENV_DATA_INDEX_SPECVAL] to store the current namespace when the frame type is MAGIC_TOP or MAGIC_CLASS (block handlers don't exist in this case)