YJIT: Avoid register allocation conflict with a higher stack_idx #9143
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with a higher stack_idx
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RegTemps::conflicts_withcurrently checks if it conflicts with indexes lower than the argument stack_idx. Therefore it does not detect a conflict with indexes higher than the argument stack_idx. While it works fine in most cases, it leads to a wrong allocation in the scenario demonstrated in this test_yjit script.This PR fixes it to check both lower indexes and higher indexes than the argument stack_idx.