[scan] Test we don't recompile under debugging env flags #8555
+74
−2
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When XLA_HLO_DEBUG=1 is set, the lowered HLO contains extra scope and line number information. When a function is scanned twice, the line numbers stay the same but the scopes will change. This tests that those differences don't cause the graph hash of the scan computation to change, so that we don't recompile on every scan call.
I'm able to add this test without any other code change thanks to the PRs #8550 and #8539 contributed by @rpsilva-aws