JIT

gh-134584: Eliminate redundant refcounting from `_LOAD_ATTR_INSTANCE_VALUE` #4635

Job	Run time
Interpreter (Debug)	54s
JIT without optimizations (Debug)	1s
${{ matrix.target }} (${{ ((matrix.debug && 'Debug') \|\| 'Release') }})	1s
Free-Threaded (Debug)	1s
JIT with tail calling interpreter	1s
	58s

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