[InstCombine] Update contributor guide for commuted tests (NFC) #155574
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As we have removed complexity-based canonicalization, the "thwart" pattern is no longer relevant. Also clarify that we do not expect commuted tests for constant operands.
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As we have removed complexity-based canonicalization, the "thwart" pattern is no longer relevant.
Also clarify that we do not expect commuted tests for constant operands.