gh-104584: Clean up and fix uops tests and fix crash #106492
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The uops test wasn't testing anything by default, and was failing when run with -Xuops. Made the two executor-related context managers global, so TestUops can use them (notably `with temporary_optimizer(opt)`). Made clear_executor() a little more thorough.
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Jul 6, 2023
…6492) The uops test wasn't testing anything by default, and was failing when run with -Xuops. Made the two executor-related context managers global, so TestUops can use them (notably `with temporary_optimizer(opt)`). Made clear_executor() a little more thorough. Fixed a crash upon finalizing a uop optimizer, by adding a `tp_dealloc` handler.
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This cleans up and fixes the tests for the uops optimizer and executor.
It also fixes a nasty crash when an optimizer is deallocated (which derailed gh-106489).