[OpenACC] Fix pattern API check failures in acc-loop-tiling pass (#188968) Two bugs were introduced/revealed by MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS: 1. `ACCLoopTilingImpl::matchAndRewrite` returned `success()` for loops with no tile values, triggering "pattern returned success but IR did not change". Fixed by returning `failure()` instead. 2. `moveOpsAndReplaceIVs` moved ops between blocks via `splice()` and updated operands via `replaceAllUsesInRegionWith()` without notifying the rewriter. This caused "operation fingerprint changed" errors since the moved ops' parent op and operands changed without `startOpModification`/ `finalizeOpModification`. Fixed by wrapping all moved ops (and their nested ops) with rewriter modification notifications. Assisted-by: Claude Code
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