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Micro-optimization: Avoid temporary set creation in is_proper_subtype (#19463)

This was suggested by@sterliakov in#19384 (comment)This is a part of a set of micro-optimizations that improve self checkperformance by ~5.5%.

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Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -217,8 +217,8 @@ def is_proper_subtype(`
`217`	`217`	`keep_erased_types=keep_erased_types,`
`218`	`218`	`)`
`219`	`219`	`else:`
`220`		`-assertnotany(`
`221`		`-{ignore_promotions,erase_instances,keep_erased_types}`
	`220`	`+assert (`
	`221`	`+notignore_promotionsandnoterase_instancesandnotkeep_erased_types`
`222`	`222`	`),"Don't pass both context and individual flags"`
`223`	`223`	`iftype_state.is_assumed_proper_subtype(left,right):`
`224`	`224`	`returnTrue`

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