[RISCV] Add tests for combineBinOpOfZExts. NFC #86689
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Unlike add, sub and mul, we don't have widening instructions for div, rem and logical ops, so we don't have any test coverage if we were to extend combineBinOpOfZExts to handle them. Adding tests coincidentally revealed that logical ops are already narrowed as a generic DAG combine via DAGCombiner::hoistLogicOpWithSameOpcodeHands. So we don't actually need to run combineBinOpOfZExts on them.
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Unlike add, sub and mul, we don't have widening instructions for div, rem and logical ops, so we don't have any test coverage if we were to extend combineBinOpOfZExts to handle them.
Adding tests coincidentally revealed that logical ops are already narrowed as a generic DAG combine via DAGCombiner::hoistLogicOpWithSameOpcodeHands. So we don't actually need to run combineBinOpOfZExts on them.