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gh-128045: Mark unknown opcodes as deopting to themselves (#128044)

* Mark unknown opcodes as deopting to themselves

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Original file line number	Diff line number	Diff line change
`@@ -157,6 +157,13 @@ def generate_deopt_table(analysis: Analysis, out: CWriter) -> None:`
`157`	`157`	`ifinst.familyisnotNone:`
`158`	`158`	`deopt=inst.family.name`
`159`	`159`	`deopts.append((inst.name,deopt))`
	`160`	`+defined=set(analysis.opmap.values())`
	`161`	`+foriinrange(256):`
	`162`	`+ifinotindefined:`
	`163`	`+deopts.append((f'{i}',f'{i}'))`
	`164`	`+`
	`165`	`+assertlen(deopts)==256`
	`166`	`+assertlen(set(x[0]forxindeopts))==256`
`160`	`167`	`forname,deoptinsorted(deopts):`
`161`	`168`	`out.emit(f"[{name}] ={deopt},\n")`
`162`	`169`	`out.emit("};\n\n")`

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