gh-134584: Eliminate redundant refcounting from `_STORE_ATTR_INSTANCE_VALUE`#142759

Fidget-Spinner merged 3 commits intopython:mainpython/cpython:mainfrom

Zheaoli:manjusaka/134584-store-instance-attrZheaoli/cpython:manjusaka/134584-store-instance-attrCopy head branch name to clipboard