JIT

gh-139757: Add BINARY_OP_SUBSCR_USTR_INT #4869

Job	Run time
Interpreter (Debug)	11m 3s
${{ matrix.target }} (${{ ((matrix.debug && 'Debug') \|\| 'Release') }})	0s
JIT without optimizations (Debug)	0s
Free-Threaded (Debug)	0s
JIT with tail calling interpreter	0s
	11m 3s

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