[LoopInterchange] Update tests for reduction2mem (NFC) (#181629) The current ongoing work on DependenceAnalysis will degrade its analysis capability. As a result, some existing tests will start to fail, meaning that those tests are no longer meaningful. To preserve their original intent, they need to be updated so that DependenceAnalysis can still analyze them accurately. This patch updates the test cases for the reduction2mem feature in LoopInterchange. Specifically, it replaces the loop bounds with constant values, which should not alter the intent of the tests.
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