ZJIT: Re-introduce allocation fast path - #18241
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Re-enable rb_gc_impl_zjit_new_obj_fastpath, was stubbed to "return false" by the recent rlgc merge. The bump-pointer state moved out of the deleted rb_ractor_newobj_cache_t into the per-objspace rb_heap_t.newobj, so the fastpath and the JIT codegen now index that struct and reach it through ractor->objspace instead of ractor->newobj_cache.
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Re-enable rb_gc_impl_zjit_new_obj_fastpath, was stubbed to "return false" by the recent rlgc merge. The bump-pointer state moved out of the deleted rb_ractor_newobj_cache_t into the per-objspace rb_heap_t.newobj, so the fastpath and the JIT codegen now index that struct and reach it through ractor->objspace instead of ractor->newobj_cache.