[SCF] allow indexing operations for loop coalesceing (#183180) Currently if there are operations between the loops we get a dominance issue as the delinearlized index is added after the operations. This PR fixes that. For testing we also add a transform pattern that makes a direct call to coalesceLoops as the existing pattern calls coalescePerfectlyNestedSCFForLoops which does not consider the loop nest perfectly nested if there are operations between them which is safer for that usage. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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